ConvertNest

Developer Tools

Essential developer utilities executed entirely in the browser. Format payloads, validate syntaxes, and encode or decode formats safely.

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JSON Formatter

Pretty print, minify, validate and highlight JSON code blocks

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JSON Validator

Parse and validate JSON payload syntaxes offline

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JSON to CSV

Convert JSON array data to CSV sheets instantly

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CSV to JSON

Convert CSV rows to structured JSON arrays offline

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Base64 Converter

Encode or decode strings and binary files to Base64 format

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Base64 Encoder

Encode strings or binary files to Base64 hashes

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Base64 Decoder

Restore files or text from Base64 strings

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URL Encoder

Sanitize URL parameters using percent-encoding

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URL Decoder

Decode percent-encoded URL string parameters

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HTML Encoder

Escape HTML tags and characters into safe entities

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HTML Decoder

Restore parsed tag strings from HTML entities

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SHA256 Generator

Calculate SHA-256 cryptographic hashes of strings

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MD5 Generator

Generate MD5 checksum hashes of text blocks

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JWT Decoder

Decode and inspect JSON Web Token payloads instantly

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Regex Tester

Test regular expressions against custom test cases

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API-Key Safe

Because payloads process in your browser sandbox, your API tokens, base64 hashes, and sensitive logs never touch our network.

WASM / Canvas Speed

Leverage local client-side processing speeds to decode large binary files and format complex nested JSON logs instantly.

Clean Outputs

Format using tabs or spaces, minify files to compress payloads, and download decoded assets directly to your downloads.