All tool catalog

Convert Unix seconds or milliseconds to dates and back, with ISO output and a chosen time zone. The Unix epoch starts at 1970-01-01 00:00:00 UTC; a time zone changes the display, not the timestamp of the same instant.

Good for converting interface examples and configuration data: preserving large integers, exact decimals, and string types without reserializing numbers through JavaScript floats.

Convert file sizes between bytes, KB, MB, GB and binary units such as KiB, MiB and GiB. Supports decimal and scientific notation, with separate 1000-based and 1024-based unit tables.

Calculate an IPv4 network address, subnet mask, broadcast address, usable IP range and host count from CIDR notation. Supports /0–/32 and preset masks; this is a calculator, not a network scanner.

Format decimal numbers with thousands separators, scientific notation, percentages, currency display and Chinese number words. Large integers and decimals retain precision; currency formatting does not convert exchange rates.

Accurately convert binary, octal, decimal, hexadecimal and base 2–36 integers. Supports positive and negative numbers and large integers, strictly checks each digit, and provides quick selection of commonly used bases.

Convert meters, inches, kilograms, pounds, US volume and temperatures in Celsius, Fahrenheit and Kelvin. Select the original unit and target unit by category, and provide common combination and exchange unit functions.

Convert between XML and JSON objects, using @_ for attributes, #text for text, and preserving numeric strings such as 00123. Explicitly note conversion loss for annotations, CDATA, and mixed content.

Exactly compute integer factorials from 0 to 5000 without losing large integer digits.

Calculate the number of days between two calendar dates, or add or subtract days to a date.

View the sign bit representation, one's complement, and two's complement representation of an integer with a specified word length.

Format, compress, and check JSON syntax online, preserving the original text of large integers, exponents, and numbers. Choose 2 or 4 space indentation and copy results with one click; all input is processed only in the browser.

Organize XML indentation or compress typesetting whitespace in the browser, support attributes and comments. Provides examples and copy functionality to clearly indicate the risk of whitespace in mixed text content and does not load external entities.

Format YAML online with 2- or 4-space indentation and syntax checks. Keeps comments, anchors and multiline text without expanding aliases; application-specific configuration still needs validation.

Use Prettier to format JavaScript/JSX, or Terser to minify JavaScript. Provides JSX examples, indented selection and direct action buttons, typing code will not run.

Format or minify CSS online with support for indentation selection, responsive media query examples, and result duplication. Styles are only processed as text and are not injected into the current web page or loaded from external resources.

Arrange query layout in standard SQL, PostgreSQL, MySQL, SQLite, T-SQL, or BigQuery. Provides dialect examples and indentation options, only handles text, does not connect to or manipulate a database.

Edit and format Markdown with a live preview of tables, task lists and code blocks, useful for drafting a README. Runs locally; raw HTML and remote images are not rendered, and content is not hosted or saved.

Encode text as Unicode code points or decode U+ notation, \u escapes and numeric HTML entities to text. Supports emoji and displays UTF-8 bytes; raw UTF-8 bytes are not supported as decoder input.

Convert ASCII text to decimal, hexadecimal or binary codes, or decode codes back to text. Supports values 0–127; use the Unicode converter for characters outside ASCII.

Encode UTF-8 text such as Chinese and emoji into Base64 or Base64URL, or strictly decode it back to text. Supports Chinese examples, one-click copying and reverse conversion of results as input.

Percent-encode and decode URLs, distinguishing between individual parameters, full URIs, and form values. Correctly handle spaces, plus signs, and delimiters, and provide examples and reverse conversion of results.

Decode a JWT to inspect its JSON header, payload and UTC time claims locally. Copy each section separately. Decoding does not verify the signature, validate access or create a new token.

Computes text digests in UTF-8, supporting SHA-256, SHA-512, SHA-1, and MD5. Examples of empty strings and line breaks are provided to facilitate troubleshooting problems with the same text but different summaries.

Convert between Latin letters, numbers, common punctuation, and international Morse code.

Generate random strings of 1–256 characters using the browser’s cryptographically secure random source, up to 100 at once. Choose letters, digits, hexadecimal or a custom character set, then copy without uploading or saving.

Locally generate 8–128 bit random passwords guaranteed to contain every character category selected. Provides common length shortcuts, batch generation and item-by-item copying. Passwords will not be uploaded, saved or written into the address bar.

Locally generate random UUID v4 or UUID v7 with millisecond timestamps, 1–1000 at a time. Supports quick quantity and case selection, and copying one by one or all.

Generates integers within a specified range using a cryptographically random source, optionally without repetition.

Query public records such as A, AAAA, MX, TXT, etc., and display TTL and parsing status.

View DKIM public records for MX, SPF, DMARC and the specified selector.

Convert IPv4 or IPv6 to a reverse lookup name and view public PTR records.

Viewing the certificate issuance authority record for the current name does not replace the complete issuance policy check.

Look at the DNS response for verification flags; unsigned does not mean verification failed.

Check the current exit IP, region and connection time, and you can also query the ASN, network organization and city information.

Split the complete link into protocols, domain names, ports, paths and fragments. Query parameters are edited individually in order of appearance, making it easy to troubleshoot duplicate keys, null values, and encoding issues.

The five segments of Cron represent minutes, hours, days, months, and weeks in sequence. First use Chinese instructions to understand the cycle, and then check the running time with time zone offset to avoid tasks being executed at the wrong time.

Parses browser, operating system, engine, device, and CPU clues from User-Agent strings. Displays parsing results by category, supports examples and manual reading of the current browser UA, and does not perform device fingerprint detection.

Compare two pieces of text locally, distinguish additions and deletions, and retain differences in spaces, tabs, and line breaks. Supports swapping sides, blank examples, and variation quantity summaries without uploading or creating sharing links.

Run browser JavaScript regex in isolation and view matching text, UTF-16 positions, capturing groups, and named groups. Provides flags switches and examples, stops with timeout, and displays up to 500 matches.

Search for independently written descriptions of common commands, read-only examples, and easily overlooked limitations.

Check out common JavaScript regular rules, matching examples, and validation boundaries, and copy and test them yourself.

Execute the short Python example in an isolated browser environment and see the printed results.

Run a short Lua example on a separate background thread and see the printed results or errors.

Open a local SQLite file, select a common data table, and view fields and records in pages.

Press o200k_base or cl100k_base to count text tokens, and check the Unicode code point, UTF-8 byte count and Token ID at the same time. Suitable for comparing text lengths without passing the results off as model bills.

Assemble roles, tasks, context, constraints, and output formats into clearly structured system prompts. Provides code review and translation examples, local editing and copying, without calling AI or executing prompt words.

Browse 18 prompt word templates, search by category and Chinese and English keywords, replace placeholders locally, edit and copy. Covers code review, debugging, writing, translation, and work planning without invoking AI.

Convert English case, word or sentence capitalization, and camelCase, PascalCase, snake_case, kebab-case naming. Provides quick operations for commonly used formats, and the original input remains unchanged.

Count Han characters, English words, Unicode characters, lines and paragraphs to check text length.

Clean spaces and blank lines, remove duplicate lines and optionally sort lists or pasted text.

Convert articles and copy between Simplified Chinese and Taiwan or Hong Kong Traditional Chinese.

Recognize English or Simplified Chinese in images in the browser and export editable text.

First recognize the text, then infer the rows and columns based on position and spacing, and export the TSV draft.

Automatically adjust the spaces between Chinese, English, and numbers to make mixed text more readable.

Use Standard fonts to arrange letters and numbers into reproducible character paintings.

Select the native voice already available on your device to read the currently entered text.

Edit bold, italics and lists locally and export basic formatting as HTML.

Convert English letters and numbers to bold, circled, or full-width Unicode characters.

Join images in order into a vertical strip, horizontal strip or grid with adjustable size, spacing and background.

Add arrows, boxes and text to local images, with preview, undo and PNG export.

Export transparent PNG using a small foreground segmentation model that runs in the browser.

Detect common objects locally and view the annotation boxes and the number of each category.

Combine multiple pictures into a looping GIF in file order and set the frame interval.

Restore the complete frame of GIF animation locally and export PNG frame by frame.

Re-encode JPEG/WebP in browser, compare original file and output size.

Set the canvas, font size and color, and format multi-line text into PNG images.

Generate QR codes with safety margins, or identify the text content of local QR code images.

Convert a local image to a Data URL, or restore a valid image Data URL to a file.

Scale proportionally to the target width, or resample the image to a specified width and height.

Read the color of the specified coordinates of the image and output HEX, RGB, HSL and transparency.

Convert images between browser-supported PNG, JPEG, and WebP formats.

Add a custom text watermark in the lower right corner of the image and choose a font size and color.

Divide the picture into nine adjacent areas and export them in order from left to right and top to bottom.

Combine low-resolution sampling, color casts, noise, and JPEG compression to create aged images.

Map the two images into grayscale transparent PNGs, showing different content on white and black backgrounds.

Crop pictures by pixels, rotate them at right angles and flip them horizontally or vertically.

Convert the image to grayscale edge line art locally, retaining original transparency.

Invert RGB channels pixel-by-pixel while keeping transparency unchanged.

Enter a Chinese kinship chain to view possible titles or reverse titles.

Set the focus duration and start, pause and continue countdown on the current page.

Use a grid per week to display the progress of a self-selected date range.

Fill in the candidate menu and randomly select one each time to reduce the confusion of choice.

Click the button to accumulate the number of times, and you can automatically turn on the short sound effects synthesized by the device.

Randomly select an original daily short sentence to give your busy day a different perspective.

Randomly select an original expression that respects each other's boundaries.

Calculate adult BMI values in kilograms and centimeters to clarify the applicable range.

Check the name of the Sixty Years corresponding to the Gregorian calendar year.

Combine page content from multiple PDFs into one new file in your chosen file order.

Read original page numbers, remove, move or rotate pages, then export a new PDF or split pages into files.

Select an ordinary XLSX worksheet or UTF-8 CSV, preview its data and convert the file format.

Align columns by header name and append data from multiple XLSX or CSV files into one table.

Trim cell whitespace, remove empty rows and deduplicate by selected columns or full rows, then export.

Select a PDF page range, render it in the browser and download the PNG page by page.

According to the order of the selected files, put the pictures on one page each and synthesize them into a local PDF.

Compress local files to a ZIP, or download files within a ZIP one by one.

Capture short video clips locally, zoom out and generate looping GIFs.

Extract audio tracks from local audio and video files and export two-channel WAV.

Convert WebM clips to H.264/AAC MP4 in supported browsers.

You choose to share the window or screen, record the screen and download it locally.