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Free developer tools

Everyday encoding, formatting and debugging tools that run entirely in your browser — no sign-up, no upload, no tracking. Pick a tool to get started.

JSON format and validateAnimated developer-console illustration for json format and validate.format.json{"id":7,"name":"svc","tags":["a","b"]}validdepth 2 · 3 keys›format.json
Base64 encode and decodeAnimated developer-console illustration for base64 encode and decode.base64.encodeTEXTBITSBASE64Hi01001000SGk=M01001101TQ==!00100001IQ==›base64.encode

Base64 Encode & Decode

Encoding

Convert text to Base64 and back, with URL-safe output. UTF-8 correct (emoji included), 100% in your browser.

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JSON format and validateAnimated developer-console illustration for json format and validate.format.json{"id":7,"name":"svc","tags":["a","b"]}validdepth 2 · 3 keys›format.json

JSON Formatter & Validator

Format

Beautify, minify, validate and key-sort JSON, with the line and column of any syntax error.

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Unix timestamp converterAnimated developer-console illustration for unix timestamp converter.epoch.convertUNIX EPOCH17304485427ISO-8601 · UTC2024-10-31T18:34:12Zlocal ⇄ UTC ⇄ epoch›epoch.convert

Unix Timestamp Converter

Time

Epoch ↔ human date (UTC/ISO) in seconds or milliseconds, with the live current Unix time.

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Cron expression builderAnimated developer-console illustration for cron expression builder.schedule.cron*/5min*hr*dom*mon1dowNEXT RUNS09:0009:0509:10every 5 min · Mon›schedule.cron

Cron Expression Generator

Scheduling

Build a cron schedule, read it in plain English and preview the next five run times in UTC.

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URL encode and decodeAnimated developer-console illustration for url encode and decode.url.encodeRAWa b&c=1ENCODEDa%20b%26c=1space%20&%26›url.encode

URL Encoder & Decoder

Encoding

Percent-encode/decode (component or whole URL) and break a URL into its parts and query parameters.

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Regular-expression testerAnimated developer-console illustration for regular-expression tester.pattern.test/\d+/g2 matchesorder-42 · row-1337group 0 · index 6, 24›pattern.test

Regex Tester

Text

Test regular expressions live with flags, highlighted matches, capture groups and a match map.

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JWT decoderAnimated developer-console illustration for jwt decoder.token.decodeHEADERalg HS256PAYLOADsub · exp · iatSIGNATUREHMAC..signature verified›token.decode

JWT Decoder

Security

Decode a JWT’s header and payload with human-readable iat/exp/nbf dates and an expiry check.

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Related tools

Developer tools that respect your data

This collection brings the everyday utilities developers and sysadmins reach for — encoding, formatting, time conversion, scheduling and token inspection — into one fast, consistent place. Every tool is client-side: your input is processed by JavaScript in your own browser, so it is never sent to a server. That makes them safe for config, tokens and other sensitive text.

They sit alongside Servnet’s other free calculators — for storage, networking, power and security. Browse everything on the free tools directory.

Developer tools — common questions

Are these developer tools really free?

Yes — every tool here is free to use with no sign-up, no limits and no ads tracking you. Servnet builds them as a resource for the developer and IT community.

Do the tools send my data anywhere?

No. Each tool runs entirely in your browser using JavaScript, so the text, JSON, tokens or URLs you paste never leave your device. That makes them safe for sensitive data.

Do I need to install anything?

No installation and no extension — open a tool and use it. They work on desktop and mobile, and most keep working even if you go offline after the page has loaded.

Who is behind these tools?

Servnet is a UK IT reseller and services company established in 2003, providing servers, storage, networking and security. These tools complement our free storage, networking, power and security calculators.

Talk to a UK specialist

Get expert advice or a no-obligation quote — servers, storage, networking, maintenance, finance and cloud. We reply the same working day.

or call 0800 987 4111