Text to Base64

Encode any text to Base64 instantly. Get standard or URL-safe output with optional MIME line wrapping — all encoding stays in your browser.

Text to encode

Output updates live on every keystroke — nothing is sent anywhere

URL-safe outputUses - and _ with no padding Wrap at 76 charsMIME line breaks for email Live encodingRecompute on every keystroke Show size statsInput bytes, output chars, overhead

Base64 output

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Type text above to generate output.

Input size-

Output size-

Overhead-

Alphabet-

Engine-

Technical Specifications

Standards and encoding rules used for every output.

Specification	Details
Standard alphabet	RFC 4648 section 4: A-Z, a-z, 0-9, +, / with = padding
URL-safe alphabet	RFC 4648 section 5: - and _ replace + and /, padding stripped
Line wrapping	Optional MIME wrap at 76 characters per line (RFC 2045)
Input encoding	UTF-8 bytes via TextEncoder, so emoji and non-Latin text encode correctly
Engine	Native btoa on chunked binary strings — no libraries, no network
Size overhead	About 33%: every 3 input bytes become 4 output characters plus padding
Live encoding	Every keystroke re-encodes instantly when Live encoding is on; the Encode button always runs on demand
Processing location	100% client-side JavaScript in your browser memory; nothing is uploaded
Export	Copy the output to clipboard or download it as a .b64 text file
Usage limit	None — encode unlimited texts for free, no signup required

Features

⚡

Instant Live Output

The Base64 result recomputes on every keystroke with native browser speed and zero dependencies.

🔗

URL-Safe Variant

One toggle swaps to the padding-free - and _ alphabet that tokens, links, and filenames require.

✉️

MIME Line Wrapping

Optional 76-character line breaks produce email-ready output that strict MIME parsers accept.

🔒

Local Device Privacy

Every operation runs in your tab's memory with plain JavaScript. Text and output never leave your device.

How to Use Text to Base64

Type or paste your Text to encode into the box. Output appears instantly when Live encoding is on.
Turn on URL-safe output for tokens, query strings, and filenames, or leave it off for standard Base64.
Turn on Wrap at 76 chars if the output feeds an email or MIME pipeline.
Click Encode to Base64 to encode on demand, Copy Output to copy the result, or Download .b64 to save it as a text file.

Understanding Base64

Base64 solves a transport problem: many older systems — email, URLs, JSON fields — safely carry only printable ASCII text. Encoding maps every 3 bytes of data to 4 text characters from a 64-symbol alphabet, so international text and emoji survive the trip intact and decode back byte-for-byte.

Where Base64 shows up daily

Email attachments ride inside MIME bodies as wrapped Base64. Web pages embed small images and fonts as data URIs to skip extra requests. APIs accept files inside JSON by encoding them first. And JWT authentication tokens join three URL-safe Base64 segments with dots — the exact variant this tool's toggle produces.

Standard versus URL-safe alphabets

Standard Base64 ends with + / and = padding, characters that browsers interpret inside links and that filesystems reject in names. The URL-safe alphabet replaces them with - and _ and drops padding; decoders re-add it automatically. Pick standard for MIME and data URIs, URL-safe for tokens and anywhere the output travels inside a URL.

The 33% size cost

Encoding is not compression: output always grows by roughly a third, which matters for large payloads and metered APIs. The breakdown card shows your exact overhead live. When size dominates, send raw bytes or compress first — encode only at the boundary that demands text.

Honest limitations

Base64 is an encoding, not encryption: anyone can decode your output in under a second, so never rely on it for secrecy — hash secrets with the Hash Generator or encrypt them properly instead. To reverse direction, use the Base64 to Text decoder. Extremely large pastes still encode correctly but allocate the full output string in tab memory.

Privacy and Client-Side Security

Privacy Guarantee: All encoding occurs locally inside your browser. Your text and output are never transmitted, stored, or recorded on remote servers.

Encoding needs no server: UTF-8 conversion and Base64 mapping are pure local math. TinyToolzz encodes with TextEncoder plus native btoa in your tab, with no libraries and no network calls.

Because nothing is uploaded, there is no waiting, no account, and no copy of your text retained anywhere. Your values exist only in the tab's memory and are discarded when you close the page or click Clear.

Frequently Asked Questions

What is Base64 encoding used for?

Base64 converts binary data to plain ASCII text so it survives systems that only handle text: email attachments (MIME), data URIs in HTML and CSS, JSON API payloads carrying files, and token formats like JWT.

Is Base64 encryption?

No. Base64 is a reversible encoding with no key, and anyone can decode it instantly. It provides zero secrecy - never use it to hide passwords or sensitive data. Use real encryption or hashing for protection.

What is the difference between standard and URL-safe Base64?

Standard Base64 uses + and / with = padding, which break URLs and filenames. The URL-safe variant swaps them for - and _ and drops the padding, which is what JWTs and web tokens require.

Why is Base64 output longer than my input?

Every 3 input bytes become 4 output characters, so output grows by about 33% plus up to 2 padding characters. This tool shows the exact overhead for your input live.

Is my text sent to any server for encoding?

No. All encoding runs 100% locally inside your web browser with plain JavaScript. No text or output leaves your device or is stored anywhere.

Is this Text to Base64 encoder free to use?

Yes, TinyToolzz Text to Base64 is 100% free to use with no registrations, daily limits, or software downloads required.

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Text to Base64

Technical Specifications

Features

Instant Live Output

URL-Safe Variant

MIME Line Wrapping

Local Device Privacy

How to Use Text to Base64

Understanding Base64

Where Base64 shows up daily

Standard versus URL-safe alphabets

The 33% size cost

Honest limitations

Privacy and Client-Side Security

Frequently Asked Questions

Related Encoding Tools