Skip to content
OneKitly
Sign up · Sign in

Byte counter (UTF-8)

Count the characters, UTF-8 bytes, words and lines in your text. Takes a whole file, so a long log does not have to go through the clipboard.

Related tools

All Encoding & decoding tools →
Base64 Encoder / DecoderEncode and decode Base64 online — free.Hex to text converterDecode a hexadecimal string back into readable text (ignores spaces and 0x prefixes).HTML Entity Encoder / DecoderConvert text to HTML entities and back, escaping <, >, &, quotes and optionally all non-ASCII characters.JSON String Escape / UnescapeTurn raw text into a JSON-safe string and back, with control characters, \uXXXX, emoji surrogate pairs and lone surrogates handled exactly like JSON.stringify.JWT decoderDecode a JWT, read its claims and dates, and check its HMAC signature.String escape / unescapeEscape a string for JSON/JavaScript or unescape it back to raw text.Text to hex converterConvert text to hexadecimal and back, byte by byte in UTF-8 — é is c3 a9 and an emoji is four bytes.Unicode escape / unescapeEscape non-ASCII characters to \uXXXX sequences, or decode them back.

Byte counter (UTF-8) works straight from this page — free, instant, nothing to install. It sits under Encoding & decoding in our catalogue, alongside Base64 Encoder / Decoder and Hex to text converter.

How to use it

  1. Open the tool — no signup or install needed.
  2. Enter your input or adjust the available options.
  3. Get your result instantly, then copy or download it.

Frequently asked questions

What does Byte counter (UTF-8) do?

Count the characters, UTF-8 bytes, words and lines in your text. Takes a whole file, so a long log does not have to go through the clipboard.

When would I actually use this?

Reading a payload someone sent you, embedding a small file in a config, and finding out why a query string breaks once it reaches the server.

What is the most common mistake?

Treating Base64 as a form of protection. It is an encoding, not encryption — anyone can decode it instantly, and a token pasted into a public issue is a leaked token.

What else is filed next to it?

Base64 Encoder / Decoder, Hex to text converter and HTML Entity Encoder / Decoder share its section. They are not variants of it — being filed together is not the same as being alike — but that is where to look if this turned out not to be the tool you wanted.

Where do the figures come from?

The encodings follow their RFCs, so a round trip is lossless. URL encoding has two variants — one that encodes a space as %20 and one as a plus sign — and the tool says which it applies.

Further reading

All guides →
ExplainerCounting Characters Against a Limit Someone Else SetOne emoji is 1 character, or 7, or 11, or 25, depending on who is counting. Which one your form, your database and your SMS gateway mean — and a one-paste test that tells you which you are facing.GuideCharacter Limits That Actually Bite: Code Units, Code Points and GraphemesA character is three different things at once. One emoji with a skin tone is 1 grapheme, 2 code points and 4 UTF-16 units. Every count in this guide was measured in Node, plus why an SMS drops from 160 to 70 and why VARCHAR(255) is not 255 of anything in particular.ExplainerEscaping a String for JSON: Three Characters Are Mandatory, and One Is a TrapRFC 8259 requires exactly three things to be escaped inside a JSON string. Everything else is optional. The one that actually breaks pipelines is a lone surrogate — legal in JSON text, impossible in UTF-8, and silently replaced the moment your data is written out.ExplainerWhat Is a JWT (JSON Web Token)?A JWT is a compact, signed token used to carry identity between services. Here's its three parts, how it's used for auth, and its security limits.GuideBuilding a URL With Parameters That Survives a Copy-PasteThree encodings, one visible difference: %20 or +. The builder's form mode matches URLSearchParams byte for byte on seventeen values — but give it a base URL with a fragment and every parameter lands inside the hash, where no server sees it.ExplainerWhat Is Inside a JWT — and What It Does Not ProtectA JWT is signed, not encrypted. Anyone holding the token can decode the payload and read every claim in it. Here is a real token, decoded without any key, plus the three attacks the signature is supposed to stop and the one problem it cannot solve.