I Built 24 Free Browser Tools That Run 100% Client-Side — No Upload, No Tracking

xueboyang1985 — Sat, 30 May 2026 07:29:00 +0000

Six weeks ago, I started building browser-based tools as a side project. Today, I have 24 tools — and they have collectively handled zero server requests. Because there is no server.

Every tool is a single HTML file with vanilla JavaScript. Hosted on GitHub Pages. No frameworks, no build step, no backend, no database.

Hub page: https://xueboyang1985.github.io/free-browser-tools/

The Stack

Hosting: GitHub Pages (free, global CDN)
Frontend: Vanilla HTML/CSS/JS — no build tools, no frameworks
PDF: pdf-lib, jsPDF, pdf.js
QR: qrcodejs
Images: Canvas API
Crypto: Web Crypto API

Why Client-Side?

Most free online tools make you upload files to a server. With client-side tools your data never leaves your computer. No tracking. Works offline.

The 24 Tools

PDF Tools — merge, split, images to/from PDF, extract images
Image Compressor — JPG/PNG/WebP, adjustable quality
Image Resizer & Cropper — aspect ratio lock
Background Remover — neural network via WebAssembly, no API key needed
Password Generator — crypto.getRandomValues, customizable
QR Code Generator — URLs, WiFi, email, vCard
JSON-CSV Converter — bidirectional, bigint support
Base64 Encoder — text + file encoding
Color Picker — EyeDropper API, HEX/RGB/HSL
HTML Formatter & CSS Minifier
URL Encoder — full URL + component encoding
Timestamp Converter — Unix, ISO 8601, relative time
Number Base Converter — binary/octal/decimal/hex
Random Generator — numbers, coin, dice, picker, shuffle
Text Diff Checker — line/char diff, highlighted
Word Counter — words, chars, reading time
Case Converter — camelCase, snake_case, kebab-case
Markdown Editor — live preview, GFM
UUID Generator — v4 and v7, bulk up to 1000
WhatsApp Chat Formatter — export to MD/HTML/CSV
Subtitle Converter — SRT to VTT to ASS
Kindle Highlights Exporter — parse My Clippings.txt

The Technical Approach

Every tool is a single HTML file. No bundlers, no React, no build step. Vanilla JS + CDN libraries.

Key APIs used: File API, Canvas API, Web Crypto API, pdf-lib, ONNX Runtime (WebAssembly for AI background removal).

Monetization

All tools are free to use. The PRO Bundle (9.99) removes free limits (e.g. 125 PDF pages, 5MB images) with a single license key across all 24 tools. One-time payment, lifetime access, 3 devices.

The Hard Part

24 tools, 6 weeks, zero server costs. Revenue so far: $0. Building was easy. Getting traffic is the real challenge.

DEV Community: xueboyang1985