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wtf is opentools?

iamadityaanjana/opentools — explained in plain English

Analysis updated 2026-05-18

★ 7TypeScriptAudience · generalComplexity · 2/5LicenseSetup · easy

TL;DR

A free website of 70+ image and PDF tools that convert, resize, compress, and edit files entirely inside your browser, with nothing uploaded anywhere.

Mindmap

mindmap
  root((opentools))
    What it does
      Converts images and PDFs
      Runs fully in browser
      No account needed
      70 plus tools
    Tech stack
      Next.js
      React
      TypeScript
      pdf-lib
    Use cases
      Convert image formats
      Compress files privately
      Edit PDFs online
    Audience
      General users
      Privacy conscious people
      Developers
    Setup
      Node.js required
      Clone and npm install

Code map

Detail Auto

An interactive map of this repo's files and how they connect — its source is parsed live in your browser. Click Visualize to build it.

filefunction / class

Why would anyone build with this?

REASON 1

Convert an image between formats like PNG, WebP, or AVIF without installing software.

REASON 2

Compress or resize photos privately without uploading them to a server.

REASON 3

Merge, edit, or reorganize PDF pages directly in the browser.

REASON 4

Explore the codebase as an example of building browser-only file processing tools.

What's in the stack?

Next.jsReactTypeScriptFramer Motionpdf-libpdfjs-distVitest

How it stacks up

iamadityaanjana/opentoolsadguardteam/ruleseditorartickc/opencode-telegram-bot
Stars777
LanguageTypeScriptTypeScriptTypeScript
Last pushed—2026-07-01—
Maintenance—Active—
Setup difficultyeasyeasymoderate
Complexity2/52/53/5
Audiencegeneraldeveloperdeveloper

Figures from each repo's GitHub metadata at analysis time.

How do you spin it up?

Difficulty · easy Time to first run · 5min

Requires Node.js 22 or newer, then a standard clone, npm install, and npm run dev.

Use freely for any purpose, including commercial use, as long as you keep the copyright notice.

Wtf does this do

Opentools is a website full of image and PDF tools that run entirely inside your web browser. You can convert, resize, compress, edit, and organize files without creating an account, and without your files ever being uploaded to a server. Everything happens locally on your own device using your browser's built in capabilities, which means the project can honestly claim that your files stay private. The project is live at opentools.fun and includes more than 70 different tools, all listed from a single shared catalog. Tools that are not finished yet are clearly marked as coming soon, rather than being hidden or shown as broken. The project is also upfront about technical limits: a format capability matrix spells out which file formats can only be read, which can only be created, and which are not practical to support inside a browser at all. Under the hood it is built with Next.js and React, using TypeScript for the code and Framer Motion for animations. Image conversion relies on a mix of codec libraries to handle formats like AVIF, WebP, JPEG, PNG, TIFF, and HEIC, while PDF related features use separate libraries for reading, rendering, and creating PDF files. Testing is handled with Vitest, focused on the pure logic that does not depend on the browser, since the actual image and PDF processing is checked by hand in a real browser instead. To run the project yourself, you need Node.js version 22 or newer, then you clone the repository, install dependencies, and start a local development server. After that, opening a browser tab at localhost shows the working site. There are also simple commands for building a production version, running tests, checking types, and linting the code. The project is released under the MIT license, a permissive license that lets you use, modify, and redistribute the code freely, including for commercial purposes, as long as you keep the original copyright notice. Overall, opentools is a practical, privacy focused toolkit aimed at anyone who wants quick image or PDF conversions without uploading files anywhere.

Yoink these prompts

Prompt 1
Explain how a website can convert image formats entirely in the browser without a server.
Prompt 2
Help me set up a Next.js project with TypeScript and Vitest for testing.
Prompt 3
Show me how to use WebAssembly image codecs like jSquash to convert AVIF or WebP files.
Prompt 4
Walk me through adding a new tool to a catalog based app like opentools.
Prompt 5
Compare browser based PDF editing libraries like pdf-lib and pdfjs-dist.

Frequently asked questions

wtf is opentools?

A free website of 70+ image and PDF tools that convert, resize, compress, and edit files entirely inside your browser, with nothing uploaded anywhere.

What language is opentools written in?

Mainly TypeScript. The stack also includes Next.js, React, TypeScript.

What license does opentools use?

Use freely for any purpose, including commercial use, as long as you keep the copyright notice.

How hard is opentools to set up?

Setup difficulty is rated easy, with roughly 5min to a first successful run.

Who is opentools for?

Mainly general.

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