URL Encode/Decode & Deep Link Parser

Easily encode, decode, and parse URL parameters for debugging.

Input Text

Result

URL / Deep Link Analysis

Enter a URL or deep link to see the parsed result.

Item	Value
Scheme / Protocol
Host / Domain
Path

About This Tool

A browser-only developer utility for URL encoding, decoding, and deep link inspection without sending data to a server.

Input

Paste practical URLs and app deep links

URL encoding converts Japanese text, spaces, symbols, and other characters into strings that can safely travel inside URLs. It is common in API queries, redirect URLs, share links, and app navigation debugging.

Custom-scheme deep links such as myapp://search?q=%E3%81%BB%E3%81%92 can be parsed too. Inspect the scheme, host, path, and query in the same interface as standard web URLs.

Query parameter values are displayed in a decoded, readable form. Per-value copy buttons make it easy to extract only the tracking ID, redirect URL, or app route you need.

Output

Review conversion and parsing together

Encode

Convert input text into a URL-safe string using behavior equivalent to encodeURIComponent. Useful when preparing URLs or search keywords for sharing.

Decode

Turn URL-encoded strings such as %E3%81%BB%E3%81%92 back into readable text. The + character is treated as a space.

Deep Link Parse

Break down both https:// URLs and custom schemes such as myapp://, then inspect query parameters as Key and Value rows.

🔗 What is URL Encoder / Decoder? Why Do You Need It?

URL encoding (also known as percent-encoding) is a mechanism that converts characters that cannot be used directly in a URL into a format using the % sign followed by hexadecimal digits. Many users searching for "url encoder" or "url decoder" have experienced confusion when dealing with Japanese text in URLs or API request parameters.

According to URL specifications, the characters that can be safely used are essentially limited to alphanumeric ASCII characters and a few symbols. Japanese hiragana, kanji, and even symbols like &, ?, and = carry special meaning in URL structure. Including them as-is can cause browsers and servers to misinterpret URL boundaries, leading to broken links or parameter misreadings.

This is where url encoding comes in. To include a Japanese word like "東京" in a URL, it is first converted to a UTF-8 byte sequence, and each byte is then transformed into the format %E6%9D%B1%E4%BA%AC. This allows any browser or server across all environments to process the URL without misinterpretation.

On the other hand, strings filled with percent signs are completely unreadable for humans. When reviewing URLs recorded in analytics tools or server logs, parameters displayed in percent-encoded notation make it impossible to intuitively understand which search keywords drove traffic or which product page was accessed. This is where url decoding becomes essential. By reversing the percent-encoding back into readable text, you can dramatically improve the efficiency of log analysis and debugging.

⚡ What Web Dev Toolkit's URL Encoder / Decoder Can Do

Instant Bidirectional Conversion (Real-Time Encode & Decode)

The moment you paste text into the input field, the result is automatically displayed without needing to press a convert button. Both encoding and decoding are available on the same screen, so whether you need to encode Japanese text or decode a percent-encoded URL from your logs back to its original string, you can proceed immediately without any mode switching.

A common real-world scenario for an online url converter is sharing a URL containing a Japanese title on a blog or social media. When you copy the URL, it turns into a long, unsightly string of percent signs. With our tool, you can decode it back to a readable format, adjust it as needed, and then re-encode it for sharing.

Accurate Handling of Japanese and Emoji (UTF-8 Compliant)

Our encoding and decoding fully support the modern web standard UTF-8 encoding. Whether your text contains Japanese hiragana, kanji, emoji, or special symbols, it is accurately converted without any garbled characters.

Some older tools designed for legacy character encodings (such as Shift-JIS) may produce garbled output when decoding Japanese URLs. However, our tool consistently processes everything based on UTF-8, so you never need to worry about compatibility with modern browsers and server environments.

Batch Conversion of Parameters and Multiple Lines

When assembling API requests, individually encoding multiple url parameters in a query string is inefficient. Our tool can process multi-line URLs or text data in one go, preserving the line-break formatting throughout the conversion.

Use cases for batch url encoding include converting a large keyword list extracted from a CSV into URL parameters, or batch-decoding multiple URLs from access logs to review the actual destination pages in a single list. This eliminates the tedious one-by-one processing and significantly reduces the time required.

🔒 Why Choose Our URL Encoder? (Privacy & Performance)

100% Client-Side Processing for Maximum Privacy

URLs often contain sensitive parameters like user IDs, session tokens, authentication credentials, or internal system paths. Pasting such URLs directly into an online tool during analytics review or API debugging poses a non-negligible risk of data leakage.

All URLs and text data entered into our tool are processed exclusively within your browser using JavaScript. No data is ever transmitted to an external server. You can verify this by operating the tool while your browser's Developer Tools (Network tab) is open. Because no server communication ever occurs, there is structurally no risk of your data being stored or recorded by any third party.

No Account Required, Completely Free

No account registration or app installation is needed. Simply open the tool in your browser and start using it immediately — no pop-up ads, no usage limits. As a free url conversion tool, it is designed not only for engineers but also for web marketers and SEO specialists who frequently need to inspect and verify URLs in their daily workflow, accessible from a bookmark in under a second.

❓ Frequently Asked Questions (FAQ)

What is URL encoding (percent-encoding)?

URL encoding (percent-encoding) is a mechanism that converts characters not allowed directly in a URL (such as Japanese text, spaces, and certain symbols) into a format combining the % sign with hexadecimal digits. This transformation ensures that browsers and servers in all environments can interpret the URL without errors.

Why does a URL become so long when it contains Japanese text?

A single Japanese character is represented by multiple bytes (typically 3 bytes) in UTF-8 encoding. Since percent-encoding converts each byte individually into the %XX format, one kanji or hiragana character expands to roughly 9 characters after encoding (e.g., %E3%81%82). This is the main reason why URLs become long and hard to read.

Is it safe to paste URLs containing sensitive parameters or access tokens?

All data entered into our tool is processed exclusively within your browser and is never sent to or stored on our servers or any third-party servers. You can verify this by checking your browser's Developer Tools (Network tab) to confirm that no external communication occurs. Please use the tool with the same level of caution you would apply to any business data.

Can garbled characters occur during encoding or decoding?

Our tool fully supports UTF-8 encoding, so text containing Japanese characters or emoji is accurately converted without garbling. However, if the source data was encoded with a legacy character encoding (such as Shift-JIS), it may not be correctly restored by UTF-8-based decoding. In such cases, we recommend verifying the encoding format of the original data.