Free Tools Online

Instantly decode or encode percent-encoded URLs. Perfect for debugging query strings and API parameters.

Instantly encode text, spaces and special characters into percent-encoded URLs with encodeURI and encodeURIComponent.

Generate MD5 hashes instantly in your browser. Secure, fast, and private - no data is sent to any server.

Instantly encode text to Base64 or decode Base64 strings back to text. Supports UTF-8 characters.

Encrypt and decrypt text with AES-128/192/256. Supports CBC, ECB, CFB, OFB, CTR modes. All processing in your browser.

Generate SHA1 hashes instantly in your browser. Secure, fast, and private - no data is sent to any server.

Convert between camelCase, PascalCase, snake_case, kebab-case and more. Perfect for standardizing variable names.

Count tokens for GPT, Claude, Gemini, Qwen, GLM, Kimi and more. Estimate context usage locally in your browser.

Format, minify and validate JSON data instantly. Supports customizable indentation with 2 spaces, 4 spaces, or tabs.

Decode and inspect JWT tokens to view header, payload, and signature with expiration status. 100% client-side processing.

Test regular expressions in real-time with match highlighting, group capture, and flag support.

Convert numbers between binary, octal, decimal, and hexadecimal number systems instantly.

Convert between metric, imperial, and Chinese length units instantly. Supports 24 units including km, m, ft, in, mi and more.

Convert HEX, RGB, HSL, HSV and CMYK colors instantly with color picker, preview, copy and local history.

Convert images to Base64 Data URLs locally in your browser. Supports PNG, JPG, WebP, GIF and SVG with preview, copy and reverse preview.

Convert images between WebP, PNG and JPG formats locally in your browser. Adjust quality, compare file sizes and download instantly.

Convert between CSV and JSON formats instantly in your browser. Supports custom delimiters, header rows, and proper escaping. 100% private, no upload.

Convert text to uppercase, lowercase, title case, sentence case and more. Supports exception words for brand names.

Find and replace text in bulk with plain text or regex.

Remove duplicate lines and words instantly.

Instantly reverse characters, flip line order, or reverse words.

Add serial numbers to each non-empty line with custom formats, start values, step sizes, and optional leading zeros.

Convert plain text into HTML with paragraph tags, line breaks, and entity encoding.

Convert between Simplified and Traditional Chinese characters instantly. Supports bi-directional conversion with history tracking.

Convert Chinese text into Pinyin with tone styles, initials, annotated ruby output, and local history.

Convert Chinese text into Cantonese Jyutping with tone controls, annotated output, and surname priority.

Convert Chinese and mixed text into pinyin initials with formatting and width controls.

Convert integers, decimals, and negative numbers into English words with optional hyphen style.

Convert Arabic amounts into strict Chinese financial uppercase for invoices, vouchers, contracts, and reimbursement forms.

Convert dates into standard Chinese cheque uppercase with strict calendar validation.

Convert amounts into cheque-style English wording with currency names, decimal style options, and ONLY formatting.

Calculate net amount, gross amount, tax amount, and tax rate with exemption support.

Estimate mainland China resident salary tax with cumulative withholding, monthly tax, and take-home pay in one view.

Convert between world currencies with the latest available ECB reference rates. Supports 30 currencies including USD, EUR, CNY, JPY, GBP.

Calculate the interval between two dates, or project target dates based on days, weeks, months, or years.

Convert between Gregorian solar dates and Chinese lunar calendar dates with heavenly stems, earthly branches and zodiac animals.

Convert a specific time between 60+ timezones worldwide. Includes a live world clock for 12 major cities.

Convert dates into US and UK English formats with full month names, abbreviations, and ordinal days.

Convert between Unix timestamps and human-readable dates instantly.

Convert between timestamps and dates in batch. Supports seconds and milliseconds, multiple date formats, and CSV export.