Why OctalOne

Privacy-first, Offline-capable utilities

Zero Uploads

Files never leave your device — full privacy by design.

Offline Ready

Load tools once and keep working without an internet connection.

Simple UI

Drag-and-drop, progress indicators, and safe downloads only when ready.

Image to PDF

Convert and merge images to a single PDF. Choose page size, margins, layout. 100% private.

Image Compressor

Compress JPG, PNG, WebP images instantly. Reduce file size by up to 90%. No uploads, 100% private.

Image Resizer

Resize images by pixel dimensions or percentage. Optional aspect ratio lock. 100% private.

Image Converter

Convert images to JPG, PNG, WEBP, or BMP instantly. 100% private, client-side conversion.

Image Rotator

Rotate and flip images instantly in your browser. Batch rotate 90°, 180°, 270° or flip. 100% private.

PDF Merge

Combine multiple PDFs into one. Drag to reorder, preview pages, download instantly. 100% private.

PDF Split

Break a PDF into multiple chunks and download them as a ZIP.

EMI Calculator

Plan EMIs, interest, and the amortization schedule for home, car, personal, and education loans.

SIP Calculator

Calculate returns on SIP or Lumpsum investments with inflation adjustment.

JSON Beautifier

Paste or drop JSON and get a validated, prettified result on the right side (client-side).

HTML Formatter

Beautify HTML snippets with a simple client-side formatter.

CSS Formatter

Format CSS code with a lightweight client-side formatter.

JavaScript Formatter

Format JavaScript code in the browser (lazy-loads Prettier if available).

Base64 Converter

Encode and decode Base64 data instantly. Supports UTF-8 characters.

Base64 URL Converter

Encode/Decode URL-safe Base64 strings (JWT safe).

URL Encoder

Percent-encode or decode URLs/strings instantly.

JSON Escape/Unescape

Escape text for JSON strings or unescape JSON strings.

Markdown Viewer

Preview Markdown files and encoded HTML instantly.

String Escape/Unescape

Escape/Unescape string literals (Java, JS, etc).

JWT Decode

Decode and inspect JSON Web Tokens (JWT).

Word & String Counter

Count words, characters, lines and other string metrics for pasted or uploaded text (client-side).

Remove Extra Spaces

Trim and remove duplicate spaces from text.

Online Text Editor

Write, save, and download text in a secure browser notepad.

Mouse Test

Test your mouse buttons, scroll wheel, and polling rate online.

Device Information

Get detailed information about your device, OS, screen, battery, and network.

Stay chill

No files leave your device

Explore now

Every tool includes drag-and-drop, loading states, and downloads that only appear when results are ready. Files never leave your device; processing happens in the browser.

Offline-first

Tip: load any tool, then turn off your internet — the tools continue to run completely offline.