Free online tools that run in your browser
AnyKit is a collection of 240 free utilities for developers, designers, students and everyday work — PDF, image, audio and video editors, converters, calculators, generators, text and SEO tools — organised into 14 categories. Everything runs locally on your device: no sign-up, no uploads, no watermarks and no file-size limits.
Most popular tools
Merge, split, compress, crop and edit PDFs without uploading them anywhere.
Merge PDF
Combine multiple PDFs into one file
Split PDF
Extract a range of pages into a new PDF
Rotate PDF
Rotate all pages in 90-degree increments
Delete Pages
Remove specific pages from your PDF
Extract Pages
Save a selection of pages as a new file
Formatters, converters, testers and generators for everyday programming work.
Media Query Generator
Generate responsive CSS breakpoints
Data URI Maker
Convert files to Base64 Data URIs for CSS
Web Vitals Simulator
Estimate Core Web Vitals scores
JSON to SQL Schema
Inferred SQL table definitions from JSON
JS Console Prettifier
Visual debugger for complex JS objects
Count, clean, convert, compare and transform text in your browser.
HTML to Markdown
Convert HTML code to Markdown syntax
Numeronym Generator
Generate abbreviations like a11y, i18n
Text to NATO
Convert text to NATO phonetic alphabet
Phone Parser
Validate and format phone numbers
Readability Analyzer
Analyze text difficulty and grading
Convert between formats, units, encodings and standards — instantly.
IBAN Validator
Validate IBAN bank account numbers instantly — checks the mod-97 checksum and country format, then shows the country, bank code and account number. Supports all SEPA and IBAN-registry countries.
Base64 to Image
Convert Base64 back to image files
Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin
IPv4 Address Converter
Convert IPv4 addresses to integer, binary, hexadecimal, and CIDR notation — essential for network programming and subnet calculations
Text to Unicode
Convert text to Unicode escape sequences
Calculators for everyday numbers — percentages, dates, health, money and more.
DateTime Hub
Advanced timezone and date calculator
Stopwatch
Millisecond timer with lap tracking
ETA Calculator
Calculate estimated time of arrival
Math Evaluator
Evaluate complex math expressions
Calculator
Simple and scientific calculator
Resize, crop, compress and convert images — plus CSS layout generators.
Camera Recorder
Record video from camera or screen
SVG Optimizer
Minify and optimize SVG vector files
CSS Grid Generator
Design complex grid layouts visually
CSS Flexbox Generator
Build flexible flexbox containers visually
Contrast Checker
Check WCAG color contrast accessibility
Convert, name, mix, compare and test colours for design and accessibility.
Modern Color Converter
Convert between HEX, RGB, HSL, OKLCH, LAB, and LCH
Color Converter
Convert between color formats
Color Distance
Calculate color distances using Euclidean, Manhattan, and Delta E metrics
Color Extractor
Extract colors from images using an eyedropper tool with canvas pixel sampling
Color Harmony
Generate color harmonies: complementary, analogous, triadic, split-complementary, tetradic, and monochromatic
Zip, unzip and rename files without installing anything.
Generate meta tags, schema, sitemaps and robots files; analyse keywords and readability.
FAQ Schema Generator
Create JSON-LD FAQ schema to get rich snippets in Google search results
Keywords Extractor & Analyzer
Extract important terms and analyze keyword density for content optimization
Meta Tags Generator
Create comprehensive SEO and social media preview tags for your website
Open Graph Generator
Create social media preview tags for Facebook, Twitter, and LinkedIn
Robots.txt Generator
Define crawling policies and control search engine access to your website
Write, preview, convert and combine Markdown.
Markdown Editor
Write Markdown with a live side-by-side preview, syntax highlighting, and file upload/download
Markdown to HTML
Convert Markdown syntax to clean, ready-to-use HTML code
Markdown Table Generator
Create Markdown tables with an interactive editor, alignment options, and live preview
Combine Markdown
Merge multiple Markdown files into one document with custom separators
Markdown Cheatsheet
A quick reference guide for all common Markdown syntax with copy-to-clipboard support
Passwords, UUIDs, QR codes, barcodes, invoices, placeholder text and more.
Barcode Studio
Generate Code128, EAN, UPC barcodes
Emoji Picker
Browse and copy emojis easily
WiFi QR Generator
Create QR codes for WiFi networks
ULID Generator
Generate sortable unique identifiers
Secure Token Generator
Generate secure random API tokens
Hash, encrypt, sign and inspect — all client-side.
JWT Generator
Generate signed JSON Web Tokens
PDF Integrity Check
Verify PDF signatures and metadata
SSL Decoder
Decode and inspect X.509 certificates
String Obfuscator
Mask sensitive parts of a string
Safelink Decoder
Decode Outlook / Office 365 safelinks
Convert, trim, normalise, equalise and transform audio — no upload, no watermark.
Audio Converter
Convert between MP3, WAV, FLAC, AAC, and OGG formats
Audio Trimmer
Trim and cut audio files with precision
Audio Merger
Combine multiple audio tracks into one file
Volume Adjuster
Increase or decrease audio volume levels
Audio Reverser
Reverse audio playback for creative effects
Trim, convert, compress, rotate, re-time and capture video in your browser.
Video Converter
Convert videos between MP4, AVI, MOV, WebM, MKV, and WMV formats
Video Compressor
Reduce video file size while maintaining quality with CRF presets
Video Trimmer
Cut and trim videos to desired length without re-encoding
Video Merger
Combine multiple videos into one file with format selection
Extract Audio
Extract audio track from video files to MP3, WAV, AAC, or FLAC
Why AnyKit
Most online tools upload your file to a server, process it there, and hand back a link — which means waiting in a queue, hitting size limits, and trusting a stranger with your documents. AnyKit takes the opposite approach. Every tool is built with browser technologies (JavaScript, WebAssembly, the Canvas and Web Audio APIs, FFmpeg and pdf-lib compiled to run client-side) so the work happens on your own machine. Your PDFs, photos, recordings and pasted text never leave your device.
The result is a toolbox that is fast, private and honest: no accounts, no ads between you and the result, no watermarks on your exports, and no artificial caps to push you towards a paid plan. Whether you need to validate an IBAN, trim a video, normalise a podcast to -16 LUFS, crop a PDF or find the name of a colour, the tool is one click away and works the same on a laptop, tablet or phone.
Frequently asked questions
- Are the tools really free?
- Yes. Every tool on AnyKit is free to use with no account, no trial period, no watermarks and no usage caps.
- Are my files uploaded to a server?
- No. Files and text are processed inside your browser with JavaScript and WebAssembly. Nothing is transmitted to AnyKit or any third party, which is why there are no file-size limits and nothing to delete afterwards.
- Do the tools work offline?
- Once a tool page has loaded it keeps working without a connection. Audio and video tools download the FFmpeg engine the first time they run and cache it for later use.
- Which browsers are supported?
- Current versions of Chrome, Edge, Firefox and Safari on desktop and mobile. Heavier audio, video and PDF tasks run fastest on a desktop computer.