PDF, Image, File, Data & Developer Tools

Merge, split, compress and edit PDFs, images and files.

43 tools · 100% Free · Works Offline

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Local PDF Merge ToolMerges multiple PDF files into one entirely in the browser without uploading.

QR Code GeneratorGenerates downloadable QR code images encoding a URL, text or WiFi details in the browser.

Barcode GeneratorGenerates downloadable barcode images in formats like Code128, EAN-13, UPC and Code39.

HEX RGB HSL Colour ConverterConverts colour codes between HEX, RGB and HSL with a picker.

All PDF, Image, File, Data & Developer Tools Calculators (43)

Guide to PDF Calculators

A grab-bag of everyday utilities for people who work with files, code and content: developers, designers, writers and anyone who needs to fix a PDF or image quickly. Every tool here runs entirely in your browser, so files never leave your device — which matters when you're handling a signed contract, a client's artwork or an internal data export.

Editing and assembling PDFs

Reach for split, merge, rearrange, rotate or delete-pages when you need to restructure an existing PDF; use the page counter or metadata remover before sending a file out to check its size or strip hidden author/software details.

Local PDF Merge Tool PDF Split Tool PDF Rearrange Pages Tool PDF Rotate Tool Delete PDF Pages Tool PDF Page Counter & Size Checker PDF Metadata Remover Images to PDF Tool

Resizing, compressing and converting images

Compress when the file is too large to email or upload, resize when you need exact pixel dimensions, and convert when you need a different format (e.g. HEIC or PNG to JPG); the DPI calculator tells you the physical print size at a given resolution.

Image Compressor Image Resizer Image Converter Image DPI / Print Size Calculator Aspect Ratio Calculator

Encoding, formatting and inspecting data

Use the JSON, CSV, Base64 and URL tools to reshape or clean data payloads, and the JWT decoder, hash generator and timestamp converter to inspect tokens, verify integrity or read machine dates.

JSON Formatter & Minifier CSV to JSON Converter Base64 Encoder / Decoder URL Encoder / Decoder JWT Decoder Hash Generator Unix Timestamp Converter HTML Encoder / Decoder

Developer helpers and generators

Test a pattern with the regex tester, decode a schedule string with the cron parser, spot changes with the diff checker, or spin up IDs and random values when you need throwaway test data.

Regex Tester Cron Expression Parser Text Diff Checker UUID Generator Random Number Generator Markdown to HTML Converter HTML to Markdown Converter

Colour, type and layout for design

Convert colour values between HEX, RGB and HSL, check a foreground/background pair meets legibility contrast, build a palette, and work out rem-to-px or line-height when translating a design into CSS.

HEX RGB HSL Colour Converter Colour Contrast Checker Colour Palette Generator rem to px Calculator Line Height Calculator Golden Ratio Calculator

Counting and tidying text

Count words or characters against a limit, estimate reading time for an article, fix capitalisation with the case converter, or clean a messy list by sorting and removing duplicates.

Word & Character Counter Reading Time Calculator Case Converter Line Sorter & Deduplicator

Important calculation notice

These calculators are intended for education, estimation and preliminary checks. Verify all inputs, units, assumptions, material properties and applicable standards. Safety-critical or final engineering designs should be checked by a suitably qualified professional.

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PDF, Image, File, Data & Developer Tools

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All PDF, Image, File, Data & Developer Tools Calculators (43)

PDF & Image Tools15 calculators

Developer & Data Tools17 calculators

Text & Content Tools6 calculators

Colour & Design5 calculators

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