Easy peasy, lemon squeezy.
201+ free browser tools for PDF, images, video, audio, text, code, and more. No uploads. No sign-ups. Just tools that work.
How it started
When I was twelve, my English teacher in Seoul taught us idioms. Most were forgettable — "piece of cake," "break a leg." But one made the entire class burst out laughing: "Easy peasy, lemon squeezy."
It sounded ridiculous. It sounded fun. I never forgot it.
I'm Suchan An, a developer in Seoul. Peasy didn't start as a product — it started as a folder on my laptop called weekend-tools. Every Saturday morning, I'd sit down with a coffee and build one small thing I actually needed. An image compressor because Photoshop felt like overkill for resizing a screenshot. A JSON formatter because the online ones were drowning in ads. A color converter because I was tired of Googling the same thing every week.
I didn't publish them anywhere. They were just HTML files I'd open in Chrome — no framework, no backend, no deploy pipeline. Just a <script> tag and whatever browser API solved the problem. Every file processed things right there in the browser. No uploads, no servers touching my stuff. Just local.
After a few months, the folder had dozens of tools. A colleague spotted my screen one day and asked about the PDF merger. He used it on the spot. Then shared it with his team. Then someone I'd never met emailed: "Can you add video conversion?"
That's when the phrase came back. I was naming the project, staring at a blank text field, and it just appeared: "Easy peasy, lemon squeezy." The twelve-year-old in me grinned.
The folder became Peasy. The Saturday ritual became 201+ tools across 15 specialized sites. But the test hasn't changed — if using a tool feels like work, I've failed. Every tool should be so simple it almost makes you laugh.
Your files never leave your device
Every Peasy tool processes files directly in your browser using JavaScript and WebAssembly. When you "upload" a file, it's read into your browser's memory — it never touches our servers. We couldn't see your files even if we wanted to.
This isn't just a privacy feature — it's the architecture. There is no upload endpoint. There is no server-side processing pipeline. The HTML, CSS, and JavaScript that power the tools are the only things our servers deliver.
The technology behind it
Peasy Tools are powered by modern Web APIs that make in-browser processing possible. Each category uses different browser capabilities:
Image resizing, cropping, filters, format conversion, watermarks — all rendered on your GPU.
Merge, split, compress, rotate, watermark, and extract text from PDFs entirely in JavaScript.
Full FFmpeg compiled to WebAssembly — video conversion, trimming, GIF creation in the browser.
SHA-256, MD5, HMAC, AES encryption, password generation — browser-native cryptography.
Audio trimming, format conversion, waveform visualization, noise analysis — no plugins needed.
Native gzip/deflate compression and decompression built right into the browser.
15 specialized tool sites
Each category has its own dedicated site with tools tailored to that domain.
AI-native tools
Peasy tools aren't just for browsers. Use them from your terminal, your AI assistant, or your favorite IDE.
CLI Tool
Run Peasy tools from your terminal. Pipe files, batch process, and integrate into shell scripts.
MCP Server
Connect Peasy tools to Claude, Cursor, Windsurf, and other AI assistants via the Model Context Protocol.
ChatGPT App
Use Peasy tools directly in ChatGPT. Ask it to process files, generate codes, or convert formats.
Open source
The tool engines, CLI, and MCP server are open source. Each tool has its own repository for easy integration and contribution.
Suchan An
Developer in Seoul. Weekend toolmaker.
Started with a folder of HTML files. Now it's 201+ tools that run entirely in your browser. If a task can be done locally, it should be — no installs, no uploads, no friction.