Tools for your security and your everyday work.
Check a link before you open it, protect your company's email or clean a photo before you post it.
All tools
1. Security & privacy
Is it a scam? (Online check)Paste a message or link you received and see its warning signs: brand look-alikes, new domains, short links, scam wording.Scammed or hacked? What nowSteps for the first hours after a scam or a hack: a bad link, a shared code, a stolen WhatsApp, money sent.Is this file safe?See what a file from WhatsApp or email really is and spot attachment tricks: disguised programs, macros, PDF scripts, SMS-reading apps.Short link expander (Online check)See where a short link (bit.ly, t.co, tinyurl…) really goes before you click it: every redirect, the final URL and warning signs.Website security scan (Online check)Passive check of a website's homepage: HTTPS redirect, TLS certificate, HSTS, CSP, clickjacking, cookie flags and security.txt, with a grade and fixes.SSL certificate checker (Online check)Check any site's SSL/TLS certificate: whether it's valid, when it expires, who issued it, which names it covers and the TLS version in use.Lookalike domain detectorCheck a link or domain for look-alike tricks: letters from other alphabets, digits for letters, a hidden real domain.Domain age checker (Online check)See when a domain was registered, when it expires, its registrar and nameservers.Password generatorRandom passwords (8 to 128 characters) or passphrases, made in your browser with its cryptographic generator.Certificate decoderPaste a PEM certificate to read its subject, issuer, validity dates, SANs, key type and size, and its SHA-256 and SHA-1 fingerprints.Leaked password check (Online check)Check if a password appears in known data breaches without sending it: with k-anonymity only 5 characters of its hash leave your device.Link cleanerStrip utm_, fbclid, gclid, si and other tracking parameters from links before you share them.Watermark an ID copyStamp who a copy of your ID is for, and the date, across the whole photo or PDF, then download a smaller copy with no photo data.Encrypt textEncrypt and decrypt messages or notes with a password (AES-256-GCM) in your browser.
2. DNS, email & network
What's my IP? (Online check)See your public IP address, whether it's IPv4 or IPv6, your country, TLS and HTTP version, and what every website can learn from your connection.Email security (Online check)Check a domain's SPF, DKIM, DMARC, MTA-STS, BIMI and DNSSEC, and get copy-ready DNS records for what's missing or wrong.SPF record builderBuild one SPF record for your domain from your mail services, servers and IP ranges.DNS lookup (Online check)Look up any domain's DNS records (A, AAAA, CNAME, MX, TXT, NS, SOA, CAA, SRV) or the reverse DNS of an IP, with TTLs and DNSSEC validation.Email header analyzerPaste an email's raw headers to see the servers it passed through, the SPF, DKIM and DMARC results your provider recorded, and signs of a forged sender.DNS propagation checker (Online check)Ask 10 public resolvers (Google, Cloudflare, Quad9, OpenDNS…) for a name's A, AAAA, CNAME, MX, NS or TXT records and see if your DNS change reached them.DMARC report readerOpen a DMARC aggregate report (.xml, .xml.gz or .zip) and see, for each sending IP, how many messages passed or failed SPF and DKIM.Is it down? (Online check)Check whether a website answers, with its HTTP status, response time, redirects and HTTPS, measured once from our server in Colombia.DMARC record generatorBuild a DMARC TXT record: policy, test mode, report addresses and alignment.Link preview checker (Online check)See how your link will look when shared on WhatsApp, X, LinkedIn or Facebook: check the title, description, og:image and Twitter card tags, with fixes.Subnet calculatorType an IP address with its prefix to get the network, mask, broadcast, usable host range and count, and split it into equal subnets.
3. Images
HEIC to JPGConvert iPhone HEIC photos to JPG or PNG in your browser, several at once, with the JPG quality you choose.Compress imagesShrink JPEG, PNG and WebP images by quality, dimensions or a maximum size in KB, several at once.Remove EXIF & GPSSee and remove hidden photo metadata (GPS location, camera, date) before you share.Resize imagesResize images by pixels or percentage, or change the aspect ratio (1:1, 4:5, 9:16…) by cropping or adding borders.Convert imagesConvert images to PNG, JPG or WebP in your browser, several at once.EPS to PNG or JPG (Uses our server)Turn an EPS file, like a logo from a designer or print shop, into a PNG with a transparent background or a JPG at 150, 300 or 600 dpi.SVG to PNGConvert SVG files to PNG with a transparent background, or to JPG.Image to Base64Turn an image into a Base64 data URL, plain Base64, an HTML <img> tag and a CSS background line, ready to paste.
4. Text
QR code generatorMake free static QR codes for links, Wi-Fi, WhatsApp, contacts, email and SMS.Word counterCount words, characters (with and without spaces), sentences and paragraphs as you type.Listen to textHear any text, or a TXT, PDF or Word file, read aloud by your device's own voices.Case converterConvert text to UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case or CONSTANT_CASE, in your browser.Compare textsPaste two versions of a text and see every added and removed line highlighted, with the changed words marked.Remove duplicate linesRemove duplicate lines from any list, sort A–Z or Z–A (natural order too), trim spaces and delete empty lines.Lorem ipsumGenerate lorem ipsum placeholder text by paragraphs, sentences or words, in classic Latin or a Spanish-looking style with accents and ñ.QR code readerRead a QR code from a photo, screenshot or camera and see what it contains, including who a payment QR pays.
5. Developer
JSON formatterFormat or minify JSON and find syntax errors by line and column.CSV to JSON converterConvert CSV to JSON or JSON to CSV with comma, semicolon or tab separators.YAML to JSON converterConvert YAML to JSON and back in your browser.Base64Encode or decode Base64 in your browser: UTF-8 text, URL-safe Base64, files to Base64 or data URLs, and Base64 back to a downloadable file.Color contrast checkerCheck the contrast ratio of a text color on its background against WCAG 2.2 AA and AAA, for normal text, large text and UI components.Cron explainerRead a 5-field cron expression as a plain sentence and see its next 5 run times in your time zone.Number base converterConvert whole numbers between decimal, hexadecimal, binary and octal, with bit length and grouped digits.HTML entity encoderEncode text as HTML entities (named, decimal or hex) or decode entities back to text: <, >, &, quotes, Spanish accents, Latin-1 symbols.URL encodePercent-encode or decode URLs and query values, and break any URL into protocol, host, path, query parameters and fragment.SHA-256 hashGet SHA-1, SHA-256, SHA-384 and SHA-512 hashes of text or files and verify a download against its published checksum.UUID generatorGenerate random UUID v4 or time-ordered UUID v7 (RFC 9562) in your browser, 1 to 1000 at a time, in uppercase or without dashes.Unix timestampConvert Unix timestamps in seconds or milliseconds to ISO 8601, UTC and your local time, or a date back to epoch.JWT decoderDecode a JSON Web Token in your browser: see the header and payload as formatted JSON and whether it has expired.Regex testerTest regular expressions live: highlighted matches, capture and named groups, flags and clear errors.
6. PDF
Compress PDF (Uses our server)Make a heavy PDF lighter so a job, university or bank portal accepts it.Word, Excel, PowerPoint to PDF (Uses our server)Turn a Word, Excel or PowerPoint file into a PDF without installing anything: .docx, .xlsx, .pptx, .doc, .xls, .ppt, .odt or .rtf.PDF to Word (Uses our server)Turn a PDF into a Word document you can edit: paragraphs, tables and images come back as a .docx.Scanned PDF to text (OCR) (Uses our server)Make a scanned PDF searchable, or get its text as a .txt file.PDF to SVG (Uses our server)Turn each page of a PDF into an SVG for Illustrator, Inkscape, Figma or a browser, sharp at any size.Remove PDF password (Uses our server)Get a copy of a protected PDF that opens without a password, or without print and copy limits, using the password you know.Merge PDFCombine several PDFs into one in your browser.Split PDFExtract pages from a PDF, split it into one file per page, or remove the pages you don't need.Rotate PDFTurn every page of a PDF, or only the ones you choose, 90° either way or 180°, and save the file that way.Delete PDF PagesType the pages to delete, like 2, 4-6, and download a copy of the PDF without them, the rest in their original order.PDF Page NumbersStamp page numbers on a PDF as 1, 1 / 12 or Page 1 of 12, in one of six positions, from any start number, skipping the cover if you want.Watermark PDFStamp a word like DRAFT or CONFIDENTIAL across the pages of a PDF, diagonal or horizontal, with the opacity and size you choose.JPG to PDFTurn JPG, PNG and WebP images into one PDF in your browser.PDF to JPGConvert each page of a PDF into a JPG or PNG image in your browser.PDF to PNGConvert PDF pages to PNG images in your browser: lossless, with crisp text and lines.Sign PDFDraw your signature or upload a photo of it, place it on any page of a PDF and download the signed file.
7. Money & work
NIT check digitCalculate or check the DIAN verification digit (DV) of a Colombian NIT or cédula with the modulo 11 formula, and see the calculation step by step.Business days ColombiaCalculate working days between two dates or add business days to a deadline in Colombia.Net salary ColombiaWork out take-home pay in Colombia from the gross monthly salary: health and pension deductions, the solidarity fund and the transport allowance, line by line.Overtime pay ColombiaWork out overtime, night and Sunday or holiday pay in Colombia from your salary and hours, with the week and surcharge in force on each date.Severance pay ColombiaCalculate the final settlement (liquidación) when a job ends in Colombia: cesantías and their interest, prima and unused vacation, with the days each covers.Cuenta de cobro PDFFill in a Colombian cuenta de cobro, the payment request freelancers send, and download it as a one-page PDF with the amount in words.UVT converterConvert between Colombian pesos and UVT (Unidad de Valor Tributario) for 2026 and 2025, with common DIAN thresholds and the rounding of article 868 ET.IVA calculator ColombiaAdd IVA to a price or take it out of a total at 19% or 5%, in whole pesos, and see what exempt and excluded mean.4×1000 GMF calculatorWork out the 4×1000 (GMF) on a withdrawal or transfer in Colombia, with or without the monthly 350 UVT exemption for savings accounts, for 2025 or 2026.
No tool matches that filter.
Guides
Guide 28 · 6 min readWorking days in ColombiaHow to count working days to a deadline in Colombia: Sundays, Saturdays, the 2026 holidays, derecho de petición terms and a worked example.Guide 27 · 6 min readNIT check digit explainedWhat the digit after the hyphen in a Colombian NIT is, how to work it out by hand the way DIAN does, and what a correct digit does and doesn't prove.Guide 26 · 7 min readSeverance pay in ColombiaHow a Colombian final settlement is worked out: cesantías, their interest, the prima and unused vacation, with the formulas and two worked examples.
╌╌ END ╌╌