Free Online Developer Tools

Browse browser-based tools for Base64, JSON, URL encoding, hashes, images and PDF files. Search by task, inspect results and copy or download your output.

Base64 encoder & decoder

Convert text and bytes with Unicode support, explicit diagnostics and complete control over your output.

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Base64 Encoder

Encode UTF-8 text, choose a character set, wrap MIME lines or convert each line independently.

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Base64 Decoder

Decode standard Base64, Base64URL and Data URIs. Inspect text and raw bytes without losing binary data.

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Base64URL Encoder & Decoder

Use the URL-safe alphabet for tokens, query parameters and identifiers.

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Image to Base64

Convert image images into exact Base64 bytes or a ready-to-use Data URI, locally.

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File to Base64

Convert any file into exact Base64 bytes or a ready-to-use Data URI, locally.

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PNG to Base64

Convert png images into exact Base64 bytes or a ready-to-use Data URI, locally.

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JPG to Base64

Convert jpg images into exact Base64 bytes or a ready-to-use Data URI, locally.

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WEBP to Base64

Convert webp images into exact Base64 bytes or a ready-to-use Data URI, locally.

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Base64 to Image

Recover the original image bytes from Base64 or a Data URI. Inspect the result before downloading.

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Base64 to PNG

Recover the original png bytes from Base64 or a Data URI. Inspect the result before downloading.

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Base64 to JPG

Recover the original jpg bytes from Base64 or a Data URI. Inspect the result before downloading.

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Base64 to WEBP

Recover the original webp bytes from Base64 or a Data URI. Inspect the result before downloading.

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Base64 to PDF

Recover the original pdf bytes from Base64 or a Data URI. Inspect the result before downloading.

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Base64 Audio Player

Decode an audio Data URI, listen locally and download the original bytes.

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SVG to Base64

Turn SVG source into a Base64 or percent-encoded Data URI for CSS and HTML.

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Data URI Inspector

Inspect MIME metadata, payload encoding and decoded bytes without opening active content.

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Base64 Validator

Check alphabet, padding, canonical pad bits, UTF-8 and detected file type in one place.

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Base64 Repair

Preview safe normalization of whitespace, Data URI prefixes and missing padding. Unknown characters remain errors.

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Conversion Workflow

Connect small operations into a repeatable recipe. See each step and exactly where a conversion fails.

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JSON Formatter

Validate, format or compact JSON while preserving every numeric token.

Data

JSON Beautifier

Validate, format or compact JSON while preserving every numeric token.

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JSON Minifier

Validate, format or compact JSON while preserving every numeric token.

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JSON ↔ YAML

Convert structured data between JSON and YAML.

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JSON ↔ CSV

Convert records to delimited text or parse CSV without losing quoted values.

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XML ↔ JSON

Convert XML attributes and text to JSON, or build XML from JSON.

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YAML ↔ TOML

Convert configuration data between YAML and TOML.

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TOML Parser

Parse TOML or generate it from JSON, preserving signed 64-bit integers.

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JSON ↔ TOML

Parse TOML or generate it from JSON, preserving signed 64-bit integers.

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XML Formatter

Format, minify or validate XML with an ordered, attribute-preserving parser.

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JSON Pointer

Read a JSON value using RFC 6901 pointers and escaped object keys.

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JSON Merge Patch

Apply RFC 7396 merge semantics: null removes a member and arrays replace arrays.

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JSON Patch

Apply RFC 6902 add, remove, replace, move, copy and test operations.

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JSONPath Tester

Evaluate RFC 9535 JSONPath, including filters and standard functions, with normalized paths and exact result values.

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JSON Lines Converter

Convert JSON Lines to an array or an array to one JSON document per line.

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JSON Flatten & Unflatten

Flatten values to escaped JSON Pointers with explicit container records for a reversible result.

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JSON to SQL

Generate escaped SQL INSERT statements from JSON records without rounding numbers.

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CSV / TSV Transpose

Swap rows and columns, preserving quoted delimiters and multiline cells.

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CSV Column Editor

Select, remove, sort, filter and deduplicate columns or rows.

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CSV to SQL

Generate SQL with explicit column types and safe string and identifier escaping.

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CSV to HTML Table

Create an escaped HTML table with a caption and header.

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TSV, CSV & JSON Converter

Convert tabular text and arrays without guessing or coercing cell types.

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Java Properties ↔ YAML

Read Java escapes and continuation lines, with optional dotted-key nesting.

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INI ↔ JSON

Preserve global and section values as strings, including repeated keys.

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JSON to TypeScript

Infer nested TypeScript models and JSON mappings from one or more representative samples.

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JSON to Go

Infer nested Go models and JSON mappings from one or more representative samples.

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JSON to Java

Infer nested Java models and JSON mappings from one or more representative samples.

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JSON to C#

Infer nested C# models and JSON mappings from one or more representative samples.

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JSON to Python

Infer nested Python models and JSON mappings from one or more representative samples.

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JSON to Rust

Infer nested Rust models and JSON mappings from one or more representative samples.

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JSON to Kotlin

Infer nested Kotlin models and JSON mappings from one or more representative samples.

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JSON to Swift

Infer nested Swift models and JSON mappings from one or more representative samples.

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JSON to Dart

Infer nested Dart models and JSON mappings from one or more representative samples.

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JSON to PHP

Generate a PHP return file preserving string escaping and exact 64-bit integers.

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XML Compare

Compare ordered XML structure, attributes, text and optional comments.

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CSS Minifier

Parse and optimize CSS safely, preserving the meaning of strings and values.

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JavaScript Minifier

Compress JavaScript with Terser without executing the supplied program.

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HTML Minifier

Remove comments and collapse safe HTML whitespace, keeping preformatted content intact.

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SQL Formatter

Format SQL using dialect-aware parsing. Query text is never executed.

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Markdown ↔ HTML

Render Markdown to HTML or convert HTML back to readable Markdown.

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Markdown Table Generator

Build a Markdown table from editable CSV, with column alignment and escaped pipes.

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Mermaid Diagram

Render Mermaid flowcharts, sequences and diagrams locally, then download SVG.

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HTML to Plain Text

Extract text and paragraph breaks while excluding script and style content.

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HTML to Markdown

Convert headings, tables, links and code to Markdown without loading input resources.

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HTML to JSX

Generate a React component with JSX attributes, style objects and form defaults.

Data

Base16 Encoder & Decoder

Convert UTF-8 text or exact bytes with Base16; inspect and download decoded bytes.

Encoding

Base32 Encoder & Decoder

Convert UTF-8 text or exact bytes with Base32; inspect and download decoded bytes.

Encoding

Base45 Encoder & Decoder

Convert UTF-8 text or exact bytes with Base45; inspect and download decoded bytes.

Encoding

Base58 Encoder & Decoder

Convert UTF-8 text or exact bytes with Base58; inspect and download decoded bytes.

Encoding

Base91 Encoder & Decoder

Convert UTF-8 text or exact bytes with Base91; inspect and download decoded bytes.

Encoding

Base122 Encoder & Decoder

Convert UTF-8 text or exact bytes with Base122; inspect and download decoded bytes.

Encoding

Base2048 Encoder & Decoder

Convert UTF-8 text or exact bytes with Base2048; inspect and download decoded bytes.

Encoding

Base36 Encoder & Decoder

Convert arbitrary-size integers or text bytes to alphanumeric Base36.

Encoding

Base62 Encoder & Decoder

Convert bytes with a configurable 62-character alphabet.

Encoding

Crockford Base32

Human-readable Base32 with optional modulo-37 checksum verification.

Encoding

Base85 Encoder & Decoder

Adobe ASCII85 with zero compression and optional document delimiters.

Encoding

ASCII85 Encoder & Decoder

Adobe ASCII85 with zero compression and optional document delimiters.

Encoding

Z85 Encoder & Decoder

ZeroMQ Z85 for byte lengths divisible by four. No hidden padding or byte trimming.

Encoding

Text to Hex Converter

Convert UTF-8 bytes with explicit byte grouping and lossless binary downloads.

Encoding

Hex to Text Converter

Convert UTF-8 bytes with explicit byte grouping and lossless binary downloads.

Encoding

Binary Converter

Convert UTF-8 bytes with explicit byte grouping and lossless binary downloads.

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Octal Converter

Convert UTF-8 bytes with explicit byte grouping and lossless binary downloads.

Encoding

Binary Coded Decimal

Encode decimal digits using 8421, 2421, 5421, Excess-3 or Gray digit codes.

Encoding

Gray Code Converter

Convert non-negative integers to reflected binary Gray codes and back.

Encoding

Bech32 / Bech32m

Encode and validate checksummed strings using BIP173 or BIP350.

Encoding

Elias Gamma Coding

Encode integer sequences with explicit, reversible bit-level codewords and checked boundaries.

Encoding

Elias Delta Coding

Encode integer sequences with explicit, reversible bit-level codewords and checked boundaries.

Encoding

Elias Omega Coding

Encode integer sequences with explicit, reversible bit-level codewords and checked boundaries.

Encoding

Golomb Coding

Encode integer sequences with explicit, reversible bit-level codewords and checked boundaries.

Encoding

Rice Coding

Encode integer sequences with explicit, reversible bit-level codewords and checked boundaries.

Encoding

Exp Golomb Coding

Encode integer sequences with explicit, reversible bit-level codewords and checked boundaries.

Encoding

Fibonacci Coding

Encode integer sequences with explicit, reversible bit-level codewords and checked boundaries.

Encoding

Unary Coding

Encode integer sequences with explicit, reversible bit-level codewords and checked boundaries.

Encoding

Comma Coding

Encode integer sequences with explicit, reversible bit-level codewords and checked boundaries.

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Morse Code Translator

Translate letters, digits and common punctuation using International Morse code.

Encoding

Baudot / ITA2 Code

Encode teleprinter text with explicit letters and figures shifts.

Encoding

Manchester Code

Encode UTF-8 bytes or binary bits using IEEE, Thomas or differential Manchester.

Encoding

Hamming Error Correction

Encode and correct Hamming(7,4), with optional SECDED overall parity.

Encoding

Delta Encoding

Encode number differences, XOR deltas or ZigZag differences without floating-point loss.

Encoding

Huffman Encoder & Decoder

Explore lossless coding with a portable JSON record containing the model required to decode.

Encoding

Shannon–Fano Encoder & Decoder

Explore lossless coding with a portable JSON record containing the model required to decode.

Encoding

LZ77 Encoder & Decoder

Apply a reversible compression or transform with inspectable output and explicit limits.

Encoding

Run-Length Encoder & Decoder

Apply a reversible compression or transform with inspectable output and explicit limits.

Encoding

Burrows–Wheeler Encoder & Decoder

Apply a reversible compression or transform with inspectable output and explicit limits.

Encoding

Move-to-Front Encoder & Decoder

Apply a reversible compression or transform with inspectable output and explicit limits.

Encoding

Tunstall Encoder & Decoder

Explore lossless coding with a portable JSON record containing the model required to decode.

Encoding

Arithmetic Encoder & Decoder

Explore lossless coding with a portable JSON record containing the model required to decode.

Encoding

Quoted-Printable Encoder & Decoder

Encode UTF-8 or file bytes with an interoperable legacy format and validate decoded data.

Encoding

UUencode Encoder & Decoder

Encode UTF-8 or file bytes with an interoperable legacy format and validate decoded data.

Encoding

XXencode Encoder & Decoder

Encode UTF-8 or file bytes with an interoperable legacy format and validate decoded data.

Encoding

yEnc Encoder & Decoder

Encode UTF-8 or file bytes with an interoperable legacy format and validate decoded data.

Encoding

BinHex 4.0 Encoder & Decoder

Encode UTF-8 or file bytes with an interoperable legacy format and validate decoded data.

Encoding

Bubble Babble Encoder & Decoder

Encode UTF-8 or file bytes with an interoperable legacy format and validate decoded data.

Encoding

ROT13 / ROT47

Reversible character rotation for text puzzles; this is not encryption.

Encoding

Intel HEX

Create and validate firmware records, extended addresses and checksums.

Encoding