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Cron expression parser
Paste a cron expression to see it in plain words with upcoming run times, or build it field by field; crontab and Quartz both work.
Free and no sign-up. Cron expression parser computes and renders entirely in your browser; nothing you enter is uploaded.
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- Nginx formatter — Paste nginx.conf to re-indent it by brace level; directives, comments and quoted strings are preserved exactly and unbalanced braces are reported.
- URL encoder / decoder — Switch between encoding and decoding with either encodeURIComponent or encodeURI scope, showing the encoded character count live.
- Regex tester — Enter a regular expression and test text to highlight every match live, list each match position and its capture groups, and preview the replacement result.
- Markdown editor — Edit Markdown on the left and preview it live on the right, with a toolbar that inserts headings, lists, tables and code blocks in one click; images and files can be uploaded, dropped or pasted in as embedded content, Markdown / Word / PPT / PDF / Excel / EPUB / RTF / OpenDocument documents convert to Markdown locally in your browser, and the rendered HTML is ready to copy or export as PDF.
- Password generator — Generate strong random passwords from a length and character set, optionally excluding look-alike characters, in batches, with a strength and entropy estimate.
- Amount in words — Convert an amount into Chinese financial capital characters (yuan, jiao, fen) along with the upper-case digits, the Chinese reading and a thousands-separated form.
- IP address — Parse an IPv4 / IPv6 address into its type, binary and decimal forms and subnet details (network address, broadcast address, usable range). Opening the page also looks up your public outbound IP from our backend, configured per environment.
- Web-safe colours — Browse all 216 web-safe colours grouped by the red channel (each channel steps 00 / 33 / 66 / 99 / CC / FF); click a swatch to select it, then copy the HEX, the 3-digit shorthand, RGB, HSL, HSV, CMYK and the contrast against black or white text. Any colour you type is snapped to the nearest safe colour, and you can filter by value or show greys only.
- Emoji library — Browse all 1849 emoji from Unicode 15.1 in nine groups (smileys, people, animals, food and more). Search by Chinese or English name — everyday words like "red packet" or "happy birthday" work too — then click any emoji to copy it instantly; recent picks are remembered for next time. Everything runs locally in the browser; nothing is uploaded.
- Properties to YAML — Paste Java .properties content and get a nested YAML that follows the dot hierarchy: equals, colon and whitespace separators are all supported, along with \t \n \uXXXX escapes and line continuations that end with a backslash. Every value is emitted as a string (single-quoted; multi-line content keeps its line breaks as a block scalar), comments and blank lines follow the entry they belong to, and keys that collide with nested children are flattened back to their full dotted names with a note at the end. Everything runs locally in the browser; nothing is uploaded.
- YAML to Properties — Paste YAML content and get flattened .properties key-value pairs: nesting and arrays expand along the dot hierarchy (arrays use index keys), every value is emitted as a string and escaped the java.util.Properties way; whole-line and end-of-line comments move above the entry they belong to (in .properties a # only works at the start of a line — one appended after a value would be read into it), and the result can be re-sorted in ascending / descending order. Everything runs locally in the browser; nothing is uploaded.
- YAML validator — Paste YAML and check the syntax as you type: when it is invalid, the page points at the exact line and column, shows the offending line with a ^ marker and gives a concrete fix suggestion (unclosed quotes, unbalanced brackets, misaligned indentation, duplicate keys, tab indentation, full-width colons and more); when it is valid, it reports the document, line and character counts plus warnings about legal-but-risky writing. Everything runs locally in the browser; nothing is uploaded.
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Frequently asked questions about Cron expression parser
- What is the difference between 5-, 6- and 7-field cron? Which one should I write?
- Five fields are the Linux crontab style — minute hour day month weekday — with one-minute resolution. Six fields add seconds in front, which is what Spring @Scheduled and Quartz use (Quartz also wants a question mark in either day-of-month or weekday), with one-second resolution. Seven fields append a year at the end, common in Quartz and some scheduling platforms. Pick by framework: crontab -e on a server is five fields, a CronTrigger in Java is six or seven. Switching the field count here keeps what every field says and only adds or removes seconds and the year.
- Why do the run times here differ from when the server actually fires?
- Run times are computed in the browser’s local time zone, so a server in another time zone is off by whole hours. Schedulers also have their own tolerance and catch-up rules: a restart, a stuck job, or only one node of a cluster actually running the task all make the real moment differ from the ideal sequence. To line them up, set the server and browser time zones to the same value, then check the next fire time the scheduler itself reports.
- What do L, W and # mean, and why do some platforms reject them?
- L means last (in the day field the last day of the month; in the weekday field 5L is the last Friday of the month), W means the nearest workday to a given day (15W), and # means the nth weekday of the month (5#2 is the second Friday). All three are Quartz extensions that plain crontab does not understand — pasting them into crontab is an error. Conversely, 0 and 7 both meaning Sunday, or the MON-FRI abbreviations, are crontab conventions that most Java schedulers accept too. When moving between platforms, rewrite the extensions first.
- Does the content these tools process stay local?
- No. Your input exists only in the memory of the current page, is released when you reload or close it, and is never written to local storage.
- Can I keep using the tools offline?
- Once the page has loaded, formatting, encoding, regex and password calculations need no network; only the IP address page needs to be online, because it asks our backend for your local outbound address when it opens.
- Do I need to register or pay to use Cron expression parser?
- Almost every tool is free, needs no registration or sign-in and has no usage limit; the few pay-per-use features (such as AI watermark removal, AI image generation, AI upscaling, AI annotation, and AI flowchart, mind-map and Mermaid generation) state their prices on the page.
- Is the data I process with Cron expression parser uploaded to a server?
- No. Calculation and rendering run locally in the browser and your input is never sent to a server; only the IP address page asks our backend for your outbound address when it opens, and that request carries none of your input. Features that need the backend (such as AI watermark removal, AI image generation, AI upscaling, AI annotation, AI flowchart and mind-map generation and "Financial statements – Small Business Accounting Standards") state their upload scope on their own pages.
About Local Toolbox
Local Toolbox gathers the small tools you reach for every day into one place: formatters, encoding converters, date maths, ID card and address parsing, image and QR code handling, password and amount conversion. Open a page and start working — no sign-up, and almost every tool has no usage limit.
Most features compute inside your browser, so your input never leaves your device; the pages are plain static assets, load fast and keep working offline. The IP page asks our backend for your outbound address when it opens and sends none of your input. AI watermark removal, AI background removal, AI image generation and AI upscaling send content to our backend for inference (watermark removal is ¥1 per run; background removal is ¥1 per run; image generation and upscaling are priced by resolution — 2K ¥2, 4K ¥3); AI annotation sends images to a large model that locates the target and returns coordinates (¥0.5 per image, refunded only when every image in the batch fails); AI flowchart, AI mind-map and AI Mermaid chart generation send your text description to a model that builds the diagram (three separate products, charged ¥0.5, ¥0.5 and ¥0.5 per run respectively); and the accounting helper sends the income, expense, social-insurance and balance figures you fill in to generate a report (¥0.5 for the spoken analysis, ¥1 for the report). These features accept Alipay only, upload nothing before payment succeeds, and refund automatically if processing fails.
- Local first: Parsing, conversion, encoding and image processing all happen in your browser and nothing you type is uploaded (AI watermark removal and AI background removal need the image, AI image generation and upscaling need one upload to obtain a URL, AI annotation needs the images for the model, AI résumé rewriting needs your résumé text, AI flowchart and mind-map generation need your text description, and the accounting helper needs the figures you submit).
- Pay per use, prices in plain sight: Almost every tool is free, needs no account and has no usage limit. Only AI watermark removal (¥1 per run), AI background removal (¥1 per run), AI image generation and AI upscaling (2K ¥2, 4K ¥3), AI annotation (¥0.5 per image), AI résumé rewriting (¥0.5 per run), AI flowchart, mind-map and Mermaid chart generation (¥0.5, ¥0.5 and ¥0.5 per run) and the accounting helper (¥0.5 for the spoken analysis, ¥1 for the report) are charged per use. Payment is Alipay only, nothing is uploaded before you pay, and failed runs are refunded automatically.
- One link per tool: Every tool has its own link, so bookmarks and shared URLs always land on the same page.
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