Is Base64 encryption?

No, and treating it like one is how secrets leak. Base64 is just an alphabet swap — anyone who sees the string can decode it in a single function call, no key required. If your goal is to hide an API key, a password, or anything sensitive, reach for real crypto (AES, libsodium, your platform's KMS). Base64 is for transport, not secrecy.

Why does the encoded output sometimes end with = signs?

Those are padding, not corruption. Base64 outputs in groups of 4 characters, so if your input isn't a multiple of 3 bytes, the encoder pads the last group with one or two = to fill it out. URL-safe Base64 typically strips the padding (decoders re-add it on the other side) — both forms are valid.

Why does my Urdu/emoji text get encoded weirdly?

It shouldn't, with this tool. The converter uses TextEncoder to produce UTF-8 bytes first, so Urdu, Arabic, Chinese, and emoji round-trip cleanly. If a server-side decoder is mangling them into question marks, the bug is on that end — it's almost certainly assuming Latin-1 instead of UTF-8. Fix the decoder, not your input.

What's the size overhead?

Roughly 33% bigger. Every 3 bytes of input become 4 Base64 characters, so a 1 MB file lands around 1.37 MB encoded. That's fine for tokens, signatures, and tiny inline assets. Painful if you're tempted to inline a 5 MB hero image as a data URL — for anything beyond a few KB, ship the binary separately and link it.

What's the difference between Base64 and Base64URL?

Base64URL is the URL-safe variant: it swaps + for - and / for _, then typically drops the = padding. That matters because + and / are reserved in URLs and inside JWT segments, where they'd silently break things. JWT, OAuth, and most modern web APIs use Base64URL — using standard Base64 there is one of the most common reasons a token "looks right" but never validates.

Base64 Encode / Decode — Encode text or files to Base64 (and back)

Base Converter

Convert integers between binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16) — built for programmers debugging memory addresses, bitmasks, and hex colors.

Unix Timestamp Converter

Translate Unix epoch timestamps (seconds or milliseconds since Jan 1 1970 UTC) to readable ISO, UTC, and local-timezone dates — auto-detects format and handles the Y2038 problem.

Color Converter

Translate colors between HEX, RGB, and HSL with a live swatch preview — built for CSS work, brand palette design, and converting Tailwind shades between formats.

Word Counter

Live word, character, sentence, and paragraph counter with reading and speaking time estimates — ideal for essays, blog SEO, tweets within 280 chars, and timed speeches.

Case Converter

Instantly convert text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, and kebab-case — ideal for variable renaming, URL slugs, and headings.

Password Generator

Generate cryptographically secure random passwords (6 to 64 chars) using the browser's Web Crypto API, with strength meter and optional uppercase, digits, and symbol character sets.

Text Reverser / Palindrome Checker

Reverse any text character-by-character or word-by-word, plus check classic palindromes like "A man, a plan, a canal: Panama" while ignoring spaces, punctuation, and case.

QR Code Generator

Create QR codes from URLs, text, Wi-Fi, contact cards, email, phone, SMS, and locations. Free PNG and SVG download.

Premium Converters

Premium Converters

Base64 Encode / Decode