Base64 decode online in seconds. Encode or decode Base64 text, strings, files, and data URI images — live mode, URL-safe, copy & download. 100% local, no upload.
This free base64 decode tool also encode base64 in one panel. Paste text or a data URI, flip URL-safe mode, and convert instantly — a practical base 64 converter for developers.
100% browser-local
Encode and decode run on your device — payloads never upload
No backend storage
Tokens, strings, and files stay in this tab
Private by design
No account required to use this base64 decode tool
What is Base64 decode
What Is Base64 Decode? Convert Base64 to Text Online
Base64 decode turns Base64 text back into bytes or readable strings. Use it to recover API tokens, base64 to json payloads, email MIME parts, or binary attachments encoded for transport.
Base64 is an encoding — not encryption. A good base64 decode online tool also supports encode base64, charset choices, line-by-line decode, and base64url encode for URL-safe strings. People also search to decode base 64 online with the same local workflow.
Base64 decode
Convert Base64 text back into the original bytes or UTF-8 string.
Encode base64 / text to base64
Turn plain text or binary into Base64 for transport in JSON, XML, or URLs.
b64 decode
Short-hand search intent for the same decode action.
Base 64 converter
Bidirectional tool that encodes and decodes in one place.
Base64 decode image
Decode a data URI or raw Base64 into a previewable PNG/JPEG.
Base64url encode
URL-safe alphabet using -/_ and optional padding strip.
String to base64
Encode a Unicode string with a chosen charset (usually UTF-8).
Base64 decode file
Decode Base64 from a text file and download the binary result.
How to Use
How to Base64 Decode Online (3 Steps)
1
Paste Base64 or plain text
Drop Base64 into the input for decode, or plain text for encode. Optional: load a file.
2
Pick options and convert
Choose charset, live mode, line-by-line, or URL-safe. Hit Convert — or let live mode update as you type.
3
Copy, download, or preview
Copy the result, download text/binary, or preview decoded images from data URIs. Nothing leaves your browser.
BASE64 DECODE IMAGE
Base64 Decode Image — Data URI Preview in Browser
Working with base64 decode image payloads? Paste a data:image/...;base64,... string and get an instant preview plus downloadable bytes — ideal for CSS sprites, email HTML, and design handoff.
How to decode a Base64 image safely
1Paste the full data URI or raw Base64 of the image.
2Keep Decode mode selected; leave charset on UTF-8 for text metadata.
3Confirm the preview looks correct (PNG/JPEG/GIF/WebP sniff).
4Download the binary file when you need the asset outside the browser.
5Prefer local tools when the image contains private screenshots.
6For CSS, keep the data URI intact; for files, download the binary.
Why local? Image Base64 often includes product UI or PII — never upload casually. Tip Huge data URIs may be slow; use file mode for multi-MB binaries.
Works with design and email workflows
Decode assets from Figma exports, MIME parts, or CMS fields without installing desktop utilities.
From Base64 string to PNG in seconds
Paste, preview, download — a focused base64 decode tool for image payloads.
ONLINE TOOL
Free Base64 Decode Tool vs Desktop Utilities
Sites like base64decode.org popularized browser decode/encode. Desktop IDE plugins and CLI (`base64`) are great offline — this page aims for the same core path with live mode, URL-safe, file encode, and image preview, all private in-tab.
Use cases
Text to Base64, Files, JSON & URL-Safe Strings
Wherever you need a base 64 converter, encode or decode locally:
API tokens & headers
Inspect Basic Auth or opaque tokens with a quick b64 decode.
Base64 to JSON payloads
Decode wrapped JSON blobs used in webhooks and feature flags.
Text to base64 for configs
Encode secrets or certificates for YAML/JSON config files.
Email MIME / attachments
Recover attachment bytes from Base64 MIME parts.
Data URI images
Preview and export images embedded as Base64 in HTML/CSS.
String to base64
Encode Unicode strings with UTF-8 for APIs and query params.
Base64url / JWT-ish strings
Toggle URL-safe alphabet when decoding padded or unpadded segments.
Base64 file encode
Encode a local file to Base64 for transfer in text-only channels.
JS debugging
Mirror browser atob/btoa behavior while inspecting network traces.
Line-by-line batch
Decode each line separately when you have multiple Base64 entries.
Features
Encode Base64 & Decode Strings Locally
Live encode / decode
Optional live mode updates results as you type — UTF-8 first.
URL-safe + line mode
base64url alphabet and per-line decode for batch lists.
Files & image preview
Encode files to Base64; preview decoded PNG/JPEG/GIF/WebP.
About this Base64 tool
Base64 Decode Online — No Upload Required
Base64 shows up everywhere: APIs, email, CSS, and config. Whether you need base64 decode online, text to base64, or a quick base64 decode image check, this page keeps the workflow in your browser.
Focused SPA surface — dual textareas, charset, live mode, copy/download — built for developers who want a dependable base64 encode decode online converter without accounts.
FAQ
Base64 Decode Online — Frequently Asked Questions
What is Base64 decode?
Base64 decode converts Base64 text back into the original bytes or string. It reverses encode base64 — it is not decryption.
How do I base64 decode online for free?
Paste Base64 into the input, keep Decode selected, and convert (or enable live mode). Everything runs locally in your browser.
Can I encode and decode Base64 on the same page?
Yes. Switch Encode / Decode modes. This base64 encode decode online tool covers both directions.
How do I base64 decode an image?
Paste a data URI or raw image Base64. If the bytes are PNG/JPEG/GIF/WebP, a preview appears and you can download the file.
What is base64url encode?
URL-safe Base64 replaces +/ with -_ and often strips padding. Toggle URL-safe mode when working with tokens or query strings.
Can I convert text to base64 or string to base64?
Use Encode mode, paste your text, choose UTF-8 (default), and convert. Copy or download the result.
Does this support base64 to JSON?
Decode the Base64 first; if the payload is UTF-8 JSON text, you will see readable JSON in the output to copy into your editor.
Is my data uploaded?
No. Encoding and decoding happen locally. Prefer this when payloads include tokens or private screenshots.
How is this different from base64decode.org?
Same core job — decode/encode with charset and live options — plus URL-safe, file encode, and image preview in a dark developer-focused UI.
What charset should I pick?
UTF-8 for modern text. ASCII/Latin-1 only when you know the original encoding used those byte ranges.
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