URL Encoder / Decoder
Encode and decode URL strings and query parameters.
URLs only allow a limited set of characters. Spaces, ampersands, unicode symbols, and JSON fragments must be percent-encoded before they appear safely in query strings or path segments. Utilitoo's URL Encoder/Decoder converts between readable text and properly encoded form in both directions.
Use it when building OAuth redirect URLs, debugging analytics parameters, fixing broken links with special characters, or preparing strings for fetch calls and curl commands. Frontend developers encode form values; backend engineers decode incoming query params during API troubleshooting and log analysis.
Encode before appending user input to a URL, and decode when reading opaque query strings from server logs. Pair with HTML Escape/Unescape for markup contexts, or Slug Generator when creating path-safe identifiers instead of encoded free text.
Everything processes locally in your browser. Utilitoo does not log or store your URLs or parameters. Free, fast, and privacy-first for web developers, marketers, and QA teams who work with links and query strings daily. Email marketers and growth teams rely on correct encoding when building UTM links, because a single unescaped ampersand can break analytics tracking in campaign URLs. Utilitoo helps you verify encoding before pasting links into Slack, Jira tickets, or documentation where broken URLs frustrate teammates.
Reach for URL Encoder / Decoder when formats disagree between services, docs, and tickets. Encode and decode URL strings and query parameters. Prefer lossless round-trips for configs you will commit back to a repository.
Common use cases
- Turning messy url encoder decoder data into something readable during a live debugging session.
- Sanity-checking exports from databases, queues, or SaaS admin panels with URL Encoder / Decoder.
- Building fixtures and examples for docs or tests from real url encoder decoder samples.
- Avoiding a full IDE or CLI install when you only need a one-off url encoder decoder transform.
- Reproducing a reported bug by pasting the exact url encoder decoder payload the user shared.
Tips & common mistakes
Use URL Encoder / Decoder when you need a fast browser-side check: Encode and decode URL strings and query parameters. Prefer plain-text pastes over rich HTML from email clients. For production-bound transforms, validate on a staging copy first. Large inputs can slow a tab - split multi-megabyte blobs when the UI feels sluggish.
Common errors
- Invalid padding - Base64 strings need correct = padding; mid-string whitespace can break decoding.
- Wrong alphabet - URL-safe Base64 differs from standard; select the matching mode.
How to use
- Paste URL or text.
- Choose Encode or Decode.
- Copy the result.
Frequently Asked Questions
How do I URL encode a string online?▼
Paste your text into Utilitoo, select Encode, and copy the percent-encoded result safe for query strings and URLs.
How do I decode a percent-encoded URL?▼
Paste the encoded string, select Decode, and view the original readable text with spaces and special characters restored.
What characters need URL encoding?▼
Reserved characters like spaces, &, =, ?, /, and non-ASCII unicode must be encoded when used inside query values or paths.
What is the difference between URL encoding and Base64?▼
URL encoding replaces unsafe characters with percent codes for URLs. Base64 represents binary data as text. Use each for its intended context.
Is it safe to encode URLs with tokens or API keys?▼
Yes on Utilitoo. Encoding and decoding run entirely in your browser with no server uploads or storage.
Related Tools
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