Felo

HTML URL Percent-Encoding Translator Online

Turn any text into URL percent-encoded output, character by character, and decode percent-encoded strings back to readable text. Each result comes as a copyable block with a short note on which characters were encoded and which were left unchanged. Try it online.

What is HTML URL Percent-Encoding Translator Online?

HTML URL Percent-Encoding Translator Online converts ordinary text into the percent-encoded form used inside URLs, and converts percent-encoded strings back into readable text. Every character is mapped to a code such as %20 for a space or %41 for an uppercase A, following the same fixed character table that simple browser-based encoders use. You paste text, say whether you want to encode or decode, and receive the exact result in a copyable block together with a short explanation of what changed.

Key Features

Exact character mapping. Spaces, punctuation, digits and both cases of ASCII letters are converted to their %XX codes, and the output preserves your input order exactly.
Both directions. Encode plain text into percent codes, or decode a percent-encoded string back into readable characters, with the decoded result checked against the same table.
Honest handling of unusual characters. Characters outside the standard table, such as accented letters beyond the Latin-1 range, emoji or non-Latin scripts, are preserved and flagged rather than silently removed.
Code explanations. Ask for a breakdown and each encoded character is listed next to its code, which is useful when you are learning how URL encoding works or debugging a broken link.
Whole-URL versus component guidance. The agent tells you whether your string looks like a complete URL or a single query value, because the two cases are encoded differently in practice.

How to Use

Paste the text you want to convert into the message box. If you want to decode, include a percent-encoded string such as hello%20world and say "decode".
State the direction if it is not obvious, for example "encode this query parameter" or "decode this URL fragment". If you say nothing, the agent assumes encoding.
Copy the result from the code block. If you need the per-character breakdown or a note on characters that were left unchanged, ask for it in the same conversation.

Example Use Cases

Building a search query URL. You have a phrase like cheap flights & hotels and need the percent-encoded query value to paste after ?q=. The agent returns cheap%20flights%20%26%20hotels and notes that the ampersand had to be encoded so it is not read as a parameter separator.
Debugging a percent-encoded link. A tracking URL arrives full of %XX sequences and you want to read the original text. Paste it, ask to decode, and get the readable string plus a note on any sequence that was not a valid code.
Checking a form field value. You are writing an HTML form or an API call and want to confirm exactly how a value with spaces, slashes and accented characters will appear once encoded.

Tips for Best Results

Say "encode" or "decode" explicitly when your input could be read either way, especially if it already contains percent signs.
If you are encoding only part of a URL, paste just that part. Encoding a whole URL turns its :// and / separators into codes, which is usually not what you want.
Ask for the character breakdown when a result looks wrong; it shows exactly which character produced which code.

FAQ

What input can I give?
Any plain text, from a single word to several paragraphs. Percent-encoded strings can be pasted for decoding. Very long inputs are handled in one pass, but extremely large blocks may be split across messages.

How accurate is the output?
Encoding and decoding are performed by a deterministic script using a fixed character table, so the same input always produces the same output. Characters outside that table are preserved and flagged rather than guessed at.

How is this different from some free text tools?
Many simple web pages show a single input box and a single output box with no explanation of what happened. This agent returns the same kind of encoded text but also supports decoding, explains each code on request, and tells you when a character could not be mapped instead of quietly dropping it.

Does it produce images or files?
No. The output is text only, delivered in copyable blocks.