50+ Best Free Online Tools in 2025 (No Signup, No Limits)

PDF Tools

PDF remains the universal document format for contracts, invoices, reports, and forms. Yet the native tools for working with PDFs are often expensive, platform-locked, or require you to upload sensitive documents to a stranger's server. The tools below run entirely in your browser using WebAssembly PDF libraries.

Merge PDF

Combine multiple PDF files into a single document with a simple drag-and-drop interface. Upload your files, arrange them in any order, and download the merged PDF in seconds. No file size limits on the free plan — because there is no "plan." This is the most common PDF task, whether you are compiling a multi-part report, combining scanned receipts for an expense claim, or assembling chapters of a document. Read our full guide: How to Merge PDF Files Online for Free.

Split PDF

Extract specific pages or ranges from a PDF. Need just pages 5–10 from a 200-page report? Want to separate a scanned booklet into individual pages? The split tool handles both by letting you specify exact page ranges or extract every page as a separate file. Useful for extracting a single contract from a bundle, pulling out the appendix from a report, or creating chapter files from a large PDF. See the full tutorial: How to Split a PDF Online.

Compress PDF

Reduce PDF file size without visible quality loss. Large PDFs — particularly those containing high-resolution scanned images — can easily exceed email attachment limits or make document management cumbersome. The compressor uses a WebAssembly PDF library to re-encode embedded images at optimised compression levels while preserving text crispness. Particularly useful for scanned documents, PDFs exported from design tools, and presentation decks. Full guide: How to Reduce PDF File Size.

Images to PDF

Convert JPEG, PNG, WebP, or GIF images into a single PDF document. Useful for creating a PDF portfolio from a folder of images, submitting scanned documents that were photographed rather than scanned, or creating a PDF photo album. Supports multiple images in a single conversion with drag-to-reorder.

PDF to Images

Export every page of a PDF as a separate PNG or JPEG image file. Essential for extracting diagrams from technical PDFs, creating image versions of document pages for web use, or when you need to edit specific pages in an image editor. All conversion happens locally — no upload to any server.

Image Tools

Image manipulation was one of the first domains where browser-based tools caught up with desktop software. Thanks to the HTML5 Canvas API and WebAssembly image processing libraries, modern browsers can resize, compress, convert, and even AI-process images at speeds comparable to native applications.

Image Compressor

Reduce JPEG, PNG, and WebP file sizes while maintaining visual quality. The compressor offers adjustable quality settings and displays the before/after file size so you can find the optimal trade-off. Essential for web developers optimising page load times, bloggers preparing images for CMS upload, and anyone sending images via email or messaging apps with file size limits.

Image Resizer

Resize images to exact pixel dimensions or by percentage. Supports aspect ratio locking, multiple output formats (JPEG, PNG, WebP), and batch-like processing. Use cases include preparing images for social media platform requirements (Twitter header: 1500×500px, Instagram square: 1080×1080px), resizing product photos for e-commerce listings, or preparing thumbnails for documentation.

Background Remover

Remove image backgrounds with AI-powered segmentation. Upload a photo and the tool automatically detects the foreground subject — people, products, logos — and removes the background, outputting a transparent PNG. Powered by an on-device machine learning model running in WebAssembly. Useful for product photography, profile pictures, presentation graphics, and social media content. For a deeper look: How to Remove an Image Background for Free.

HEIC to JPG

Convert HEIC/HEIF photos — the default format for iPhone photos — to universally compatible JPEG files. HEIC files cannot be opened by most Windows applications, many older image editors, or web browsers. Converting to JPG makes iPhone photos sharable and editable everywhere. The conversion runs locally using a WebAssembly HEIC decoder — no upload, no server.

Image to Text (OCR)

Extract text from images using Optical Character Recognition. Upload a screenshot, scanned document, or photo of printed text and receive a text output you can copy, edit, and search. Powered by Tesseract.js — a WebAssembly port of the industry-standard Tesseract OCR engine — running entirely in the browser. Supports dozens of languages. Ideal for digitising receipts, extracting text from screenshots, and processing scanned documents.

Image Cropper

Crop images to specific dimensions or freeform selections with a visual drag interface. Supports aspect ratio presets for common use cases (square for Instagram, 16:9 for YouTube thumbnails, 4:3 for presentations). No upload required — the crop happens instantly in the browser Canvas.

Image Converter

Convert between image formats: JPEG, PNG, WebP, GIF, BMP, and TIFF. WebP offers superior compression to JPEG and PNG for web images; converting your image library to WebP can reduce image file sizes by 30–50% compared to JPEG at equivalent visual quality. Use this tool to batch-convert images before uploading to a website or CMS.

Developer Tools

Developers were among the first power users of browser-based tools. JSON formatting, regex testing, Base64 encoding, and code minification are all routine daily tasks that benefit enormously from having a fast, zero-friction browser tab rather than a local script or IDE plugin.

JSON Formatter

Format, validate, and minify JSON. Paste raw or minified JSON and instantly see a formatted, syntax-highlighted, collapsible tree view. The formatter identifies syntax errors with line numbers and descriptions. Minification removes all whitespace to produce compact JSON for production use. Indispensable for API debugging, reading configuration files, and preparing JSON for storage or transmission.

Regex Tester

Test and debug regular expressions with real-time match highlighting. Enter your pattern, select flags (global, case-insensitive, multiline), and see all matches highlighted in the test string. The tool also displays captured groups for patterns with parentheses. Supports both JavaScript regex syntax and displays match details inline. Essential for writing data validation patterns, search-and-replace scripts, and log parsing rules.

Base64 Encoder/Decoder

Encode any text or binary data to Base64, or decode Base64 strings back to their original form. Base64 is used everywhere: embedding images in HTML or CSS as data URIs, encoding JWT payloads, sending binary data in JSON APIs, and encoding credentials in HTTP Basic Authentication headers. The tool supports both standard Base64 and the URL-safe variant (with - and _ instead of + and /).

URL Encoder/Decoder

Encode special characters in URLs for safe transmission, or decode percent-encoded URLs to human-readable form. URL encoding replaces characters like spaces, ampersands, and equals signs with their %XX percent-encoded equivalents. Essential when constructing query strings, debugging malformed URLs, or preparing data for form submissions.

JWT Decoder

Decode and inspect JSON Web Tokens (JWTs) without needing a library. Paste a JWT and see the decoded header (algorithm, type) and payload (claims, expiration, user data) in a readable format. Useful for debugging authentication flows, checking token expiration timestamps, and understanding what claims your backend is issuing. The decoding is client-side — the token never leaves your browser.

HTML Minifier

Remove whitespace, comments, and redundant attributes from HTML to reduce page weight. Minified HTML loads faster because browsers download fewer bytes. The tool preserves inline JavaScript and CSS while compressing the HTML structure. Useful for build pipelines, static site publishing, and optimising landing pages for PageSpeed scores.

UUID Generator

Generate RFC 4122 compliant UUIDs (Version 4, random) instantly. Generate one or bulk-generate hundreds in a single click. UUIDs are used as unique identifiers in databases, file systems, API request correlation IDs, and distributed systems where sequential IDs would create conflicts or expose business logic.

Lorem Ipsum Generator

Generate placeholder text for design mockups, UI prototyping, and print layout testing. Control the number of paragraphs, sentences, or words, and choose between classic Lorem Ipsum or generated readable English-style placeholder text. Faster than typing "placeholder text here" across every design element.

Meta Tag Generator

Generate HTML meta tags for SEO and social sharing (Open Graph, Twitter Cards) by filling in a simple form. The tool outputs ready-to-paste HTML for the page title, description, canonical URL, og:image, and Twitter card tags. Reduces the chance of missing a critical meta tag and ensures correct syntax for all major search engines and social platforms.

Security Tools

Security tools that run client-side in the browser are uniquely trustworthy — you can verify that no data is transmitted by watching the network tab. These tools handle sensitive operations locally.

Password Generator

Generate cryptographically secure random passwords with full control over length, character sets (uppercase, lowercase, numbers, symbols), and exclusions. Uses the browser's window.crypto.getRandomValues() API — the same source of randomness used by cryptographic libraries — ensuring generated passwords have genuine unpredictability. Includes a password strength indicator. Read our deep dive: How to Generate Strong Passwords and Password Entropy Explained.

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text or file input. Hash functions are one-way — you cannot reverse a hash to get the original input — making them useful for verifying file integrity, storing password hashes for comparison, generating checksums, and creating content fingerprints. The Web Crypto API performs the hashing locally.

QR Code Generator

Generate QR codes for URLs, text, phone numbers, Wi-Fi credentials, email addresses, and contact cards (vCards). Customise the size and download as PNG or SVG. QR codes are used on business cards, print marketing, packaging, restaurant menus, event tickets, and product labels. The SVG output scales to any print size without quality loss. Read the full guide: Best Free QR Code Generators.

Calculators

Specialised calculators save time compared to doing the maths in a general spreadsheet. These tools are purpose-built for their specific calculation with the right inputs, proper formulas, and context-appropriate output formatting.

Mortgage Calculator

Calculate monthly mortgage payments, total interest paid, and the full amortisation schedule for any loan amount, interest rate, and term. Enter the purchase price, down payment, annual interest rate, and loan term in years to see your monthly payment broken down into principal and interest. The amortisation table shows how much of each monthly payment goes toward principal vs interest over the full loan term — essential for understanding the true cost of a mortgage. See our guide: How to Use a Mortgage Calculator.

Loan Calculator

Calculate monthly payments, total cost, and interest for personal loans, auto loans, and student loans. Compare different loan terms (3 years vs 5 years) and interest rates to understand how they affect your monthly payment and total cost. A fundamental tool for any major borrowing decision.

BMI Calculator

Calculate Body Mass Index from height and weight, with both metric (cm, kg) and imperial (ft/in, lb) input options. Displays the BMI value, the WHO category (Underweight, Normal weight, Overweight, Obese), and a visual scale showing where the result falls. BMI is a screening tool, not a diagnostic one — the result is interpreted in context by healthcare professionals.

Percentage Calculator

Three calculation modes in one: percentage of a number (what is 15% of 80?), percentage change between two values (from 50 to 65 is what % increase?), and what percentage one number is of another (12 is what % of 80?). Covers every percentage scenario encountered in business, finance, cooking, and everyday life.

Age Calculator

Calculate exact age in years, months, and days from a date of birth to today or any other date. Also calculates the number of days until a future date — useful for countdowns. Uses proper calendar arithmetic accounting for leap years, varying month lengths, and timezone adjustments.

Text Tools

Text manipulation is a daily need for writers, editors, developers, and content creators. These tools handle the tedious mechanical operations that would otherwise require manual work or a one-off script.

Word Counter

Count words, characters (with and without spaces), sentences, paragraphs, and estimated reading time. Displays a keyword frequency analysis showing the most common words and phrases. Essential for writers hitting word count targets, SEO professionals checking content length, and anyone needing to trim text to fit a specific limit (tweet length, job application fields, academic assignments).

Case Converter

Convert text between uppercase, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case, and more. Developers frequently need camelCase for JavaScript variables, PascalCase for class names, snake_case for Python and database fields, and kebab-case for CSS classes and URL slugs. Having all conversions in one tool eliminates the need to remember individual regex patterns.

Remove Duplicates

Remove duplicate lines from any text input, with options to sort alphabetically, preserve or remove blank lines, and ignore case when detecting duplicates. Useful for cleaning up lists of email addresses, URLs, keywords, or any line-separated data where duplicates would cause issues.

Text Diff

Compare two text inputs and highlight the differences line-by-line. Useful for comparing versions of a document, checking what changed between two API responses, or identifying differences between configuration files. The diff highlighting shows added lines in green and removed lines in red, matching the familiar git diff colour scheme.

Text Repeater

Repeat any text a specified number of times with a custom separator. Useful for generating test data, creating repeated patterns for design tools, or populating database fixtures with repetitive content.

Converter Tools

Data format and unit conversion tools are among the most searched-for utilities on the web. These cover the conversions that come up most often in professional and everyday contexts.

Unit Converter

Convert between metric and imperial units across all major categories: length (miles/km/feet/metres/inches), weight (kg/lb/oz/stone), temperature (°C/°F/K), volume (litres/gallons/cups/fl oz), area (m²/sq ft/acres/hectares), speed (km/h/mph/m/s/knots), and data (bytes/KB/MB/GB/TB). See our comprehensive guide: Complete Guide to Unit Conversion and the practical tutorial: How to Use an Online Unit Converter.

Timestamp Converter

Convert Unix timestamps to human-readable dates and vice versa. Displays conversions in both UTC and local time, and supports both second-precision and millisecond-precision timestamps. Shows the current epoch time live. Essential for developers working with APIs, databases, and log files. Read the full background: What is a Unix Timestamp?.

CSV to JSON

Convert CSV (comma-separated values) data to JSON format. Handles quoted fields with embedded commas, type inference for numeric values, custom delimiter selection, and produces clean formatted JSON output. Use it when importing spreadsheet data into APIs, NoSQL databases, or JavaScript applications. Full tutorial: How to Convert CSV to JSON. Full format comparison: CSV vs JSON.

JSON to CSV

Flatten a JSON array of objects into a CSV table. Handles nested objects using dot-notation column headers and arrays using indexed columns. The output CSV is downloadable for immediate use in Excel, Google Sheets, or database import wizards.

Number Base Converter

Convert numbers between binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16). Supports large numbers and shows the conversion to all four bases simultaneously. Useful for developers working with bitwise operations, colour codes, memory addresses, and Unix file permissions. Full guide: Binary, Octal, Decimal, and Hex Explained.

Color Converter

Convert colour values between HEX (#FF5733), RGB (rgb(255, 87, 51)), HSL (hsl(14, 100%, 60%)), and HSV formats. Displays a colour preview alongside the converted values. Front-end developers use this constantly when translating colour values between design tools (Figma uses HEX) and CSS (HSL is often more intuitive for programmatic colour manipulation).

Markdown Preview

Write Markdown in a split-pane editor and see the rendered HTML in real time. Supports all CommonMark and GitHub Flavored Markdown (GFM) syntax including tables, task lists, fenced code blocks with syntax highlighting, and strikethrough. The output panel shows rendered HTML exactly as a browser would display it. See the full syntax reference: Markdown Syntax Guide and the format decision guide: Markdown vs HTML.

Productivity Tools

Beyond single-purpose converters and formatters, a growing set of productivity tools handle complete workflows in the browser — from document creation to recording and timing.

Screen Recorder

Record your screen directly from the browser using the Screen Capture API — no extension or download required. Capture a browser tab, application window, or entire screen, with optional system audio. The recording is saved as a downloadable video file. Perfect for creating tutorial videos, recording bug reports, capturing webinars, or making quick how-to demonstrations for colleagues. Read our professional guide: Screen Recording for Tutorials: Tips for Professional-Quality Results.

Resume Builder

Create a professional resume in minutes using a structured form. Enter your work history, education, skills, and contact information and download a clean, formatted PDF resume. No design skills required — the builder handles layout, typography, and formatting automatically.

Invoice Generator

Generate professional PDF invoices for freelancers, consultants, and small businesses. Enter your business details, client information, line items, tax rates, and payment terms. The tool generates a PDF invoice you can download, print, or email directly to clients. No subscription, no per-invoice fee.

Timer and Stopwatch

A full-featured countdown timer and stopwatch with lap recording. Runs entirely in the browser tab with no need to download a dedicated app. Useful for cooking, exercise intervals, presentation timing, and productivity techniques like the Pomodoro method.

Typing Speed Test

Measure your typing speed in WPM (words per minute) and accuracy percentage. The test presents a passage of text and measures how quickly and accurately you type it within a set time. Regular practice with a speed test is one of the most effective ways to improve keyboard proficiency — a skill with direct productivity implications for anyone who types professionally.

CSS Gradient Generator

Generate linear and radial CSS gradients visually. Click to add colour stops, drag to adjust positions, and copy the generated CSS code. The live preview updates in real time. The generated CSS is cross-browser compatible and ready to paste directly into a stylesheet.

Color Palette Generator

Generate harmonious colour palettes from a base colour using colour theory rules: complementary, split-complementary, analogous, triadic, and tetradic schemes. Displays HEX, RGB, and HSL values for each colour. Useful for designers choosing a brand palette, developers building a design system, or anyone creating visually coherent graphics.

Why These Tools Are Genuinely Free

Legitimate free tools exist because the infrastructure cost is genuinely low when processing happens client-side. When a tool processes files in the user's browser:

• There are no server compute costs for file processing
• There are no storage costs for uploaded files
• The tool scales to any number of users without additional infrastructure

The hosting cost of serving the JavaScript/WebAssembly code to users is minimal. Free tools sustain themselves through display advertising revenue — the same model that funds most of the web. ToolMasta uses non-intrusive display ads to cover operational costs while keeping every tool genuinely free with no signup required.

How to Choose the Right Tool

With dozens of tools available for any given task, here is a simple framework for choosing:

1. Prioritise Privacy First

If your task involves confidential documents, personal photos, financial data, or any sensitive information, use only tools that explicitly state client-side processing. Verify by checking the Network tab in DevTools.

2. Verify the Scope of "Free"

Some tools are free with severe restrictions — 2 MB file size limits, 3 uses per day, watermarked output — designed to push users toward paid plans. ToolMasta tools have no such restrictions because client-side processing means there is no server cost to justify a paywall.

3. Check for Output Quality

For compression tools especially, test with your specific file types and compare input vs output quality. A good compression tool should reduce file size meaningfully (50%+) without visible quality degradation for the common use case.

4. Look for Ongoing Maintenance

Web tools that have not been updated in years may fail on modern file formats or browsers. Check when the tool was last updated, whether it handles current file format versions (HEIC, WebP, AVIF), and whether the browser APIs it uses are still supported.

For the full argument for browser-based tools over desktop software — covering WebAssembly, privacy, cross-platform support, and offline limitations — read Web Tools vs Desktop Software: When Free Online Tools Win.