Encoders and decoders: 75 free online tools

APNG to Base64 Converter Encode an animated PNG as Base64 and see how many frames it actually contains.

ASCII to Base64 Converter Encode plain ASCII text as Base64, with a strict switch that catches smuggled non-ASCII characters.

Audio to Base64 Converter Encode a sound file as Base64 and get a data URI, an audio element or a JavaScript snippet back.

AVIF to Base64 Converter Encode an AVIF image as Base64 and confirm the container really is AVIF before you use it.

Base32 Decode Decode Base32 back to text, accepting lowercase, missing padding and spaces.

Base32 Encode Encode text to Base32, the case-insensitive encoding used for TOTP secrets and human-typed keys.

Base58 Decode Decode a Base58 string back to text, using the Bitcoin-style alphabet.

Base58 Encode Encode text to Base58, the compact, human-friendly alphabet used by Bitcoin addresses and IPFS hashes.

Base64 Decode Decode Base64 back to text, accepting both the standard and URL-safe alphabets and data URI prefixes.

Base64 Encode Encode text to Base64 with correct UTF-8 handling, and optionally the URL-safe alphabet.

Base64 to ASCII Converter Decode a Base64 string to readable ASCII and decide what happens to the bytes that fall outside the range.

Base64 to Binary Converter Expand a Base64 string into the individual bits of every byte it encodes.

Base64 to CSS Converter Decode Base64 into a stylesheet, or wrap encoded image bytes in a complete background rule.

Base64 to CSV Converter Decode a Base64 payload into CSV and check the shape of the table before you open it.

Base64 to File Decode Base64 into a downloadable file of any type, from a PDF to a zip archive.

Base64 to Hexadecimal Converter Turn a Base64 string into the hexadecimal byte values it actually represents.

Base64 to HTML Converter Decode Base64 back into HTML markup, and render it in a sandboxed frame when you want to see the result.

Base64 to Image Paste a Base64 string or data URI, preview the image, and download it as a real file.

Base64 to Javascript Converter Decode Base64 into readable JavaScript, a string literal, or a snippet that decodes at runtime.

Base64 to JSON Decode a Base64 payload into JSON, validate it, and print it with the indentation you prefer.

Base64 to Octal Converter Decode Base64 and print each byte as a three digit octal value.

Base64 to Text Converter Decode a Base64 string back to readable text, choosing the character set when UTF-8 is not the answer.

Base64 to TSV Converter Decode Base64 into tab separated rows, and switch them to comma separated in the same pass.

Base64 to XML Converter Decode Base64 into XML, confirm it is well-formed, and re-indent it so you can actually read it.

Base64 to YAML Converter Decode Base64 into YAML and confirm it parses before you apply it anywhere.

Base85 Decode Decode ASCII85 back to text, handling the Adobe delimiters and the z zero-group shorthand.

Base85 Encode Encode text to ASCII85, a more compact binary-to-text encoding than Base64, used in PDF and PostScript.

Binary to Base64 Converter Turn a run of ones and zeros into a compact Base64 string ready to travel as text.

Binary to Text Decode 8-bit binary back to readable text, interpreting each byte as UTF-8.

BMP to Base64 Converter Encode a Windows bitmap to Base64 for a data URI, a resource file or a legacy application.

Caesar Cipher Encode or decode text with a Caesar cipher using any shift you choose.

CSS to Base64 Converter Encode a stylesheet as Base64, a data URI or a self contained link tag.

CSV to Base64 Converter Encode a table as Base64 for an API field, an attachment or a download link.

GIF to Base64 Converter Encode a GIF, animation and all, into a Base64 data URI you can paste anywhere.

Hex Decode Convert hexadecimal byte values back to text, ignoring whatever separators the input uses.

Hex Encode Convert text to the hexadecimal values of its UTF-8 bytes, with separators to match any format.

Hex to UTF-8 Read hexadecimal bytes back as UTF-8 text, including accented letters and other multibyte characters.

Hexadecimal to Base64 Converter Pack hexadecimal byte values into a shorter Base64 string ready for a header, a token or a config file.

HTML Decode Turn named, decimal and hexadecimal HTML entities back into the characters they stand for.

HTML Encode Convert text into HTML entities so angle brackets, quotes and symbols display instead of being parsed.

HTML to Base64 Converter Encode HTML markup as Base64 or as a ready to use data:text/html URI.

Image to Base64 Convert an image to a Base64 data URI, CSS background rule or img tag, without the image ever leaving your device.

Javascript to Base64 Converter Encode a script as Base64, a data URI or a complete script tag you can paste into a page.

JPEG to Base64 Converter Convert a JPG photo into Base64 for a data URI, a stylesheet rule or an API payload.

JSON to Base64 Validate a JSON document and encode it to Base64, ready for a token, a header or a queue message.

JWT Decoder Decode a JSON Web Token to read its header and payload, with the expiry and issued-at times shown in a readable form.

Morse Code to Text Decode International Morse code back to readable text.

Morse Code Translator Translate text into International Morse code, with letters spaced and words separated by a slash.

MP3 to Base64 Converter Encode an MP3 as Base64 and read its bitrate, sample rate and tag status first.

Octal to Base64 Converter Assemble octal byte values into bytes and encode them as Base64.

PNG to Base64 Converter Turn a PNG into a Base64 data URI, a CSS rule or an img tag without the file leaving your device.

Punycode Converter Convert international domain names to punycode and back, a whole list at a time.

Punycode Decode Decode a punycode (xn--) domain back to its readable Unicode form.

Punycode Encode Convert an internationalised domain name into its ASCII punycode (xn--) form.

Quoted-Printable Decode Decode quoted-printable email text, turning =XX escapes and soft breaks back into readable characters.

Quoted-Printable Encode Encode text as quoted-printable, the MIME format that keeps ASCII readable and escapes the rest.

ROT13 Encoder and Decoder Apply ROT13, the letter-rotation cipher where encoding and decoding are the same operation.

ROT13 to Text Paste ROT13 text and read what it says, including the digit rotating variant.

ROT47 Encoder and Decoder Apply ROT47, which rotates every visible ASCII character, not just letters, and is its own inverse.

SVG to Base64 Converter Encode an SVG as a Base64 data URI, or as the shorter percent-encoded form that CSS prefers.

Text to Base64 Converter Encode text to Base64 with correct UTF-8 handling, one blob or one line at a time.

Text to Binary Convert text to 8-bit binary, one group of eight bits per UTF-8 byte.

Text to ROT13 Shift every letter thirteen places along the alphabet to hide a spoiler, a hint or a puzzle answer.

TSV to Base64 Converter Encode tab separated rows as Base64, optionally retabbing comma separated input on the way.

Unicode Code Point Finder List the Unicode code point of every character in a string, in the notation you choose.

Unicode Escape Convert non-ASCII characters into \uXXXX escape sequences for source code and config files.

Unicode Unescape Decode \uXXXX, \u{...}, U+ and numeric HTML Unicode escapes back into characters.

URL Decode Decode percent-encoded text from a URL or query string back into readable characters.

URL Encode Percent-encode text so it is safe inside a URL, with three modes for different parts of the URL.

UTF-8 Converter See the UTF-8 bytes behind any text in six notations, and turn a list of bytes back into readable text.

UTF-8 Decode Turn a UTF-8 byte sequence, written as hex or percent escapes, back into text.

UTF-8 Encode Show the UTF-8 bytes behind any text as escaped hex, so you can see how each character is stored.

WebP to Base64 Converter Encode a WebP image to Base64 and get the shortest inline payload of any common format.

XML to Base64 Converter Encode an XML document to Base64, with an optional check that the tags balance before you send it.

YAML to Base64 Converter Check that your YAML parses, then encode it as Base64 for a secret or a config field.

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