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Input
Text
URL limit
8 KiB
Runtime
Browser

Decode one percent-encoded UTF-8 URL component

Decode a component in one strict pass without query-form plus handling or hidden double decoding.

Local processingNo sign-upNo fetch or upload

Decode component

URL text stays in this tab. Nothing is opened or checked online.

Tool Swim does not upload, fetch, save, log, or create presets from these values.

Decoded component text

Results are inert text or JSON with the applied interpretation visible.

What this tool proves

Explicit URL interpretation

The decoder follows decodeURIComponent. Literal plus remains plus; use the query parser when plus-as-space form semantics are required.

One decode pass avoids hidden delimiter changes

The decoder follows decodeURIComponent. Literal plus remains plus; use the query parser when plus-as-space form semantics are required.

Malformed percent triplets, truncated sequences, and invalid UTF-8 fail. Successful output includes a one-pass disclosure.

Private, bounded URL processing

The operation runs only after you choose it. Input stays in the current browser tab: Tool Swim does not fetch a destination, resolve DNS, test reachability, upload content, save an account preset, or invoke the developer API.

URLs are capped at 8 KiB, query text at 256 KiB, component text at 64 KiB, query lists at 2,000 pairs, each query name or value at 8 KiB, and serialized output at 1 MiB.

Primary references

Questions and answers

Related URL tools

URL Component EncoderEncode component text once without treating it as a full URL, query string, or Base-N payload.Query String ParserInspect duplicate-preserving application/x-www-form-urlencoded query data without flattening it into an object.URL ParserInspect WHATWG URL components and duplicate query entries without contacting the destination.