All tools

Inspect Processed locally

JSON Formatter & Inspector

Format, validate and inspect JSON with clear errors and readable output.

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Calculate Processed locally

Percentage Calculator

Calculate X% of Y, X as a percentage of Y, or percentage change from an original value, locally in your browser.

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Calculate Processed locally

Calendar Date Difference

Calculate signed elapsed Gregorian calendar days between two dates locally, without timezone or daylight-saving ambiguity.

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Encode Processed locally

Base64 Encoder & Decoder

Encode and decode standard or URL-safe Base64 with clear text and padding handling.

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Encode Processed locally

URL Component Encoder & Decoder

Encode individual URL components and decode percent-encoded text with explicit delimiter and plus-sign semantics.

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Generate Processed locally

Text Checksums & HMAC Generator

Generate SHA-256 and SHA-512 checksums or HMAC-SHA-256 for UTF-8 text. Text input only; no file hashing.

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Convert

Colour Converter

Convert colours between HEX, RGB and HSL formats and preview the result.

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Convert Processed locally

Unix Timestamp Converter

Convert Unix seconds, milliseconds or ISO dates with explicit timezone offsets into UTC and browser-local time.

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Convert Processed locally

Structured Data Converter

Convert structured data between JSON, YAML, CSV and XML locally, with warnings when a format cannot preserve every value.

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Inspect Processed locally

API Inspector

Inspect URLs, query parameters, JWT payloads and timestamps locally without uploading input.

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Convert Processed locally

Local Image Converter

Convert, resize and compress WebP, PNG, JPEG and other browser-supported images locally without uploading them.

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Format Processed locally

Transformation Recipes

Chain repeatable text, JSON, encoding and checksum operations locally, then share the recipe without sharing its data.

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Format Processed locally

Case Converter

Convert text to upper, lower, title, camel, Pascal, snake, kebab and constant case.

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Generate Processed locally

Password Generator

Generate cryptographically random passwords in your browser without sending the result to a server.

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Generate

Lorem Ipsum Generator

Generate configurable placeholder text for layouts, prototypes and typography tests.

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Inspect Processed locally

Text Statistics

Measure words, characters, sentences and text structure directly in your browser.

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Compare Processed locally

Text Diff

Compare two text versions and identify additions, removals and changes.

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Convert

Length Converter

Convert length between metres, kilometres, miles, yards, feet, inches and centimetres.

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Convert

Temperature Converter

Convert temperatures between Celsius, Fahrenheit and Kelvin with the formulas shown.

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Convert

Weight & Mass Converter

Convert mass between kilograms, grams, pounds and ounces.

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Convert

Duration Converter

Convert durations between seconds, minutes, hours, days, weeks and approximate calendar units.

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Convert

Area Converter

Convert area between square metric and imperial units, acres and hectares.

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Convert

File Size Converter

Convert bytes and common decimal or binary storage units with their conventions explained.

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Convert

Speed Converter

Convert common land, nautical and scientific speed units with assumptions identified.

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Convert

Pressure Converter

Convert pressure between pascals, kilopascals, bar, PSI, atmospheres, Torr and related units.

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