Runs locally
Every tool processes input in your browser. Nothing is uploaded.
Everything runs in your browser
Fast, private tools for developers & marketers
No-signup browser tools for timestamps, JSON, CSV, URLs, Base64, UTM links, 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
Seven local-first utilities for daily developer and marketing work.
Unix Timestamp Converter
Convert Unix timestamps in seconds or milliseconds to UTC, local time, and ISO dates.
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.
UTM Campaign URL Builder
Build clean campaign URLs with source, medium, campaign, term, and content parameters.
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.
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. Timestamps, CSV snippets, JSON payloads, URLs, Base64 strings, 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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