Base64 Encoder / Decoder

Encode text to Base64 or decode Base64 back to text — UTF-8 safe, instant, in your browser.

Mode

Text

Runs entirely in your browser — nothing is sent to a server.

How to use the Base64 Encoder / Decoder

Pick a mode. Choose encode (text → Base64) or decode (Base64 → text).
Paste your input. Type or paste the text or Base64 string.
Copy the result. Hit the button and copy the output to your clipboard.

Why use our Base64 Encoder / Decoder

Encode and decode. Switch modes to turn text into Base64 or convert Base64 back to readable text.

UTF-8 safe. Handles emoji and accented characters correctly, unlike a plain btoa().

Private & instant. Everything is computed locally — your data never touches a server.

Free to use — premium coming soon

FREE

✓ Encode & decode
✓ UTF-8 support
✓ One-click copy
✓ 100% private

PREMIUM

★ Remove ads
★ File-to-Base64 & data URLs
★ Bulk conversion

About the Base64 Encoder / Decoder

Base64 is a binary-to-text encoding scheme that represents arbitrary data using only 64 printable ASCII characters: the letters A-Z and a-z, the digits 0-9, and the symbols + and /, with = used as padding. It exists because many systems and protocols were designed to move plain text safely, not raw bytes. This encoder takes whatever you type or paste, treats it as UTF-8 bytes, and produces a Base64 string that you can drop into email, JSON, XML, HTML attributes, or a URL without worrying about characters being mangled in transit.

Reach for Base64 whenever binary or text data has to survive a text-only channel intact. Classic cases include email attachments (the MIME standard relies on Base64 because original SMTP only carried 7-bit ASCII), embedding small images or fonts directly in CSS and HTML as data: URIs, stashing tokens or small payloads inside JSON and JWTs, and passing configuration through environment variables or query strings. The decoder direction is just as common: you paste a Base64 blob from a config file, an API response, or a log line and instantly read back the original text.

Mechanically, Base64 reads your input three bytes at a time. Three bytes make 24 bits, which split cleanly into four 6-bit groups, and each group (a value from 0 to 63) maps to one Base64 character. When the input length is not a multiple of three, the final group is zero-padded and one or two = signs are appended so decoders know how many real bytes the last block held. Because four output characters carry only three input bytes, Base64 grows the data by roughly 33%, which is why it is an encoding for transport, never a compression step.

This tool runs entirely in your browser using the native encoder with proper UTF-8 handling, so emoji and non-Latin scripts round-trip correctly rather than throwing the classic "characters outside the Latin1 range" error that plain btoa() produces. Nothing you enter is uploaded or logged. One important note on accuracy and safety: Base64 is not encryption and provides no security at all. Anyone can decode it in a second, so never treat a Base64 string as a way to hide passwords, keys, or private data.

Frequently asked questions

Is Base64 a form of encryption?

No. Base64 is a reversible encoding, not encryption, and offers zero confidentiality. Anyone with the string can decode it instantly, so never use it to protect passwords, API keys, or sensitive information.

Why is my Base64 output longer than the original text?

Base64 turns every 3 bytes of input into 4 output characters, so the result is about 33% larger. That overhead is the trade-off for making binary-safe data fit through text-only channels like email and JSON.

Does this tool handle emoji and accented or non-English characters?

Yes. It encodes your input as UTF-8 first, so emoji, accents, and scripts like Arabic, Chinese, or Cyrillic encode and decode correctly without the Latin1 range errors that browsers throw when characters fall outside single-byte ASCII.

What do the = signs at the end of a Base64 string mean?

They are padding. When the input length is not a multiple of three bytes, the encoder adds one or two = characters so the decoder knows how many real bytes the final block contained. A correct string is always a multiple of four characters.

What is the difference between standard Base64 and Base64URL?

Standard Base64 uses + and / which can break inside URLs and filenames. Base64URL replaces them with - and _ (and often drops padding) so the string is safe to put in links, query parameters, and JWTs.

From our blog

How to Pick a Username That's Safe, Available, and Works Everywhere

By the Super Simple Digital Tools Team · Updated June 2026

Choosing a username feels trivial until you realize it becomes a semi-permanent label attached to everything you post. The handle you pick affects whether people remember you, whether you can stay consistent across services, and even how easy you are to track or impersonate. A generator removes the blank-page problem by producing dozens of candidates instantly, but the real work is filtering those candidates against three tests: is it safe, is it available, and will it survive each platform's rules.

Start with safety, because it eliminates the most options fastest. Discard any suggestion that leans on your real name, birth year, hometown, or the part of your email before the at sign. These are the exact fragments attackers harvest from public profiles to guess logins and link accounts together. The same logic argues against reusing one beloved handle on every site: a single distinctive name used in ten places lets anyone map your entire online footprint, and ties every account to the next if one is breached.

Next, pressure-test for platform rules before you fall in love with a name. The strictest common limit is Twitter/X at 4 to 15 characters with only letters, numbers, and underscores. Instagram and Discord are roomier at 30 and 32 characters and also accept periods, while GitHub stretches to 39. If you want the same handle in several places, design for the tightest box: lowercase, letters and numbers only, fifteen characters or fewer. That single rule keeps a name valid almost everywhere without awkward variants.

Only then check availability, and check it properly. The generator cannot know what is taken, so a name that looks perfect may already be claimed by the time you try it. Test your top two or three picks directly in each platform's signup field, or run them through a tool that scans many sites at once. Have backups ready, because popular word combinations get claimed quickly and you do not want to settle for a name padded with random digits just to grab something.

Finally, lock it in deliberately. Once you find a handle that passes all three tests, register it on the platforms that matter most to you the same day, even ones you are not ready to use yet, to reserve the identity. Store the username alongside its password in a password manager so you never lose track of which handle belongs to which account. A few minutes of method here gives you a clean, defensible identity instead of a tangle of mismatched names.

Design for the tightest limit first: lowercase letters and numbers, 15 characters or fewer, so the name fits Twitter/X, Instagram, Discord, and GitHub alike.
Generate a short list of five to ten favorites, not one, since your top pick is often already taken on the platform you want most.
Keep separate handles for high-risk accounts like banking and email so a leak on a casual site never exposes your sensitive logins.
Reserve a winning username on key platforms the same day you find it, then save it in a password manager next to its password.

Read the full guide →

Tool by the Super Simple Digital Tools Team. Reviewed by our editorial team. Free to use, no signup required.