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Base64 Tools Hub — Encode Decode Validate Repair

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Start with Base64. This hub links every encoder, decoder, validator, repair, JWT and data-URI tool on the site — built for developers and ranked for search in every language we support.

Home for every Base64 utility on this site. Private, fast, and built to rank for encode/decode searches in your language.

Encode & decode

Base64 Reader & Viewer Online Free Base64 viewer & reader: paste to preview images, PDF or text, enlarge fullscreen, zoom and download. Data URL to Image Convert a data URL (data:image/png;base64,...) to an image online. CSS Data URI Converter Convert every url(...) image and font in a stylesheet to a Base64 data URI. Uuencoded File Decoder Decode uuencoded files online.

Validate & fix

Base64 Validator Check whether a string is valid Base64 online. Repair Base64 Repair broken Base64 online: strips data URI prefixes, whitespace, quotes and escapes, and fixes URL-safe characters, percent-encoding and padding. Verify Base64 (Catch LLM Errors) Verify Base64 online: catch ChatGPT/Claude hallucinations with round-trip checks. Compare Base64 Strings Compare two Base64 strings online. Unwrap Nested Base64 Unwrap nested Base64 online: decode until the result is no longer Base64. Base64 Normalization Normalize Base64 to its canonical form and convert between standards: standard, MIME, PEM, Base64URL, IMAP, XML token/identifier and OpenPGP armor. Base64 Standard Detector Detect which Base64 standard was used to encode a value: standard, MIME, PEM, Base64URL, IMAP, XML token/identifier or OpenPGP ASCII armor.

Developer essentials

JWT Decoder Decode JWT tokens online: header, payload and signature, with expiry and issued-at shown as readable dates. Character Encoding Detection Detect the character encoding of Base64 text: UTF-8, Windows-1252, ISO-8859-1/2/15, Cyrillic, Shift_JIS, GBK and more. Base64 Size Calculator Calculate Base64 size online: convert bytes to Base64 characters (and back), including MIME/PEM wrapping overhead. Hash Generator (MD5, SHA-256) Generate MD5, SHA-1, SHA-256 and SHA-512 hashes for text or files in your browser. URL Encode and Decode URL encode and decode online (percent-encoding).

AI & secrets

AI Token Counter (GPT, Claude, Grok) Count tokens for ChatGPT, Claude, Grok and Cursor locally. ChatGPT / Claude Markdown Cleaner Strip ChatGPT/Claude/Grok Markdown: remove ``` fences, extract code, or convert to plain text. Redact API Keys Before AI Chat Redact OpenAI, Anthropic, GitHub, AWS, Stripe keys and JWTs before pasting into ChatGPT, Claude, Grok or Cursor.

Open the main Base64 encoder / decoder · What is Base64? · Base64URL

Why a Base64 tools hub?

People search separately for validators, repair tools, JWT decoders and data-URI converters. This hub connects them so Google and users both find the full toolkit — in every language we ship.

  • Correctness first — standards, padding and charsets explained when something breaks.
  • Privacy first — browser-local processing; no account, no upload for core Base64 work.
  • Learn next — guides and blog posts link back to the exact tool you need.

Frequently asked questions

Is Base64 encryption?

No. Base64 is encoding. Anyone can decode it. Use our guides and JWT/secret tools to handle real security correctly.

Do you upload my files?

No. These tools run in your browser. Prefer them over upload-based Base64 sites.

Related tools and guides

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