Runs locally
Every tool processes input in your browser. Nothing is uploaded.
Everything runs in your browser
Fast, private tools for everyday work
No-signup browser tools for dates, timestamps, JSON, CSV, URLs, Base64, QR codes, images, and text. Your input stays on your device.
No signup
No accounts, no email gate, no cloud history. Open a tool and go.
Fast & lightweight
Static pages and instant tools, built for repeat daily use.
Privacy-first
No tracking of tool input, with clear privacy and cookie policies.
Popular tools
Local-first utilities for daily developer, marketing, and writing work.
Unix Timestamp Converter
Convert Unix timestamps in seconds or milliseconds to UTC, local time, and ISO dates.
Date Calculator
Calculate days between dates, weekdays, and add or subtract days, weeks, months, or years.
CSV to JSON Converter
Convert CSV into structured JSON with delimiter detection, header rows, and pretty output.
URL Encoder/Decoder + Query Parser
Encode URL components, decode percent-encoded text, and parse query parameters.
Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 back to UTF-8 safely in your browser.
JWT Decoder & Encoder
Decode JWT headers and payloads, inspect claims, or encode unsigned and HMAC-signed JWTs locally in your browser.
Random String & Password Generator
Generate random strings, passwords, API-style tokens, hex values, and Base64URL-safe strings locally with Web Crypto.
Text Diff Checker
Compare text, code, config, or JSON snippets locally and highlight additions, removals, and unchanged content.
Case Converter & Text Cleaner
Convert text case, clean lines, remove duplicates, sort text, and normalize whitespace locally in your browser.
Image Compressor & Resizer
Compress JPG, PNG, and WebP images, resize dimensions, or target a smaller file size locally.
PDF Page Organizer
Merge PDFs, extract page ranges, remove pages, reorder pages, and rotate pages locally in your browser.
JPG to PDF & PDF to JPG Converter
Convert JPG, PNG, and WebP images into a PDF, or export selected PDF pages as JPG images locally in your browser.
Image to Base64 Converter
Convert PNG, JPG, WebP, GIF, or SVG images into Base64 data URLs locally in your browser.
UTM Campaign URL Builder
Build clean campaign URLs with source, medium, campaign, term, and content parameters.
QR Code Generator
Create downloadable QR codes from links or text locally in your browser.
JSON Formatter/Validator
Format, minify, and validate JSON with calm parse errors and copy-ready output.
Word/Character Counter with Reading Time
Count words, characters, sentences, paragraphs, reading time, and keyword density.
Text to Binary Converter
Encode UTF-8 text to binary bytes or decode binary back to text locally in your browser.
Why a local-first toolbox?
Most online converters ask you to paste data into a remote page and trust what happens next. WebMultitool keeps the work in your browser. Dates, timestamps, CSV snippets, JSON payloads, URLs, Base64 strings, QR codes, image data URLs, binary text, campaign links, and drafts are processed client-side.
Built for repeat use
Each page opens with the working tool first: paste, convert, copy, clear. Below the tool you get examples, edge-case notes, and concise FAQs so the page is useful both now and when you return from search.
Guides for common tasks
Start with practical guides like How to Convert CSV to JSON Without Uploading Data, How to Build UTM Campaign Links for Google Ads and GA4, and Unix Timestamp Seconds vs Milliseconds.
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