Tax & discounts
Add or remove VAT/GST/sales tax and calculate tax-equivalent discounts.
Simple online tools. Fast results. No account.
Free online calculators, text tools, network utilities and developer tools that run directly in your browser whenever possible.
Tools
Calculations
6 toolsAge calculator
Calculate age, total elapsed time, next birthday and weekday of birth.
Percentages & change
Calculate percentages and percentage change between two values.
Time since a date
Calculate days, hours, minutes and seconds since, until or between dates.
Discount calculator
Find the discount percentage, savings and sale price.
Meeting time overlap
Find working-hour overlaps across time zones.
Money & work
6 toolsFreelance rate calculator
Work out the hourly, day and project rate you need to charge as a freelancer.
Break-even calculator
Find how many units you must sell to cover your fixed costs, and the sales that takes.
Margin and markup calculator
Turn a cost and a price into margin and markup, or find the price for a target margin or markup.
Real hourly wage calculator
Find what an hour of your time is really worth once commuting, unpaid hours and work costs count.
ROAS calculator
Work out ROAS, the break-even ROAS for your margin, the profit after ad spend and the maximum cost per order.
YouTube earnings calculator
Estimate YouTube earnings from your views and your RPM, for long videos and Shorts, per month and per year.
Text & lists
7 toolsCharacter counter
Count characters, words, sentences, paragraphs, lines and spaces as you type.
Remove duplicates
Remove duplicate lines, blank lines and extra whitespace.
Sort lists
Sort lists alphabetically, numerically or randomly.
List compare
Compare two lists and find common or unique items.
Uppercase & lowercase
Convert text to upper, lower, title or sentence case.
Words from letters
Find words that can be built from the letters you provide.
Word pattern finder
Search words with patterns such as C?T or endings.
Network
6 toolsWhat is my IP?
Show your public IP and approximate Cloudflare location data.
CIDR / subnet calculator
Calculate IPv4 network, mask, broadcast and usable address range.
DNS lookup
Look up A, AAAA, MX, TXT, CNAME and NS records.
WHOIS / RDAP lookup
Look up public registration data for a domain, IPv4 or IPv6 address.
Is it down?
Check if a website is down for everyone or just you, from six regions, with the HTTP status, response time, DNS and the domain’s registration status.
Download time
Estimate file download time from size and connection speed.
Developer tools
14 toolsJSON formatter & converter
Format, validate, minify and convert JSON.
Unix timestamp converter
Convert Unix timestamps, dates, UTC, local time and ISO 8601.
Cron expression generator
Build and explain common Cron expressions.
Regex tester
Test regular expressions locally and inspect matches, groups and positions.
CSV ↔ JSON converter
Convert CSV to JSON or JSON to CSV directly in your browser.
Hash generator
Generate SHA-256, SHA-384 or SHA-512 hashes for text and files.
JWT decoder
Decode JWT header and payload locally. Signature is not verified.
URL encoder / decoder
Encode or decode URLs and text using percent encoding.
Base64 encoder / decoder
Convert text to Base64 and Base64 back to text.
Human-readable units
Convert milliseconds and bytes into readable units.
UTM builder
Create campaign URLs with UTM parameters.
Password generator
Generate strong passwords locally in your browser.
UUID generator
Generate UUID v4 identifiers locally.
QR & Wi-Fi QR generator
Create QR codes for text, links or Wi-Fi access without uploading data.
Images
4 toolsImage resizer & compressor
Resize and compress images locally with custom dimensions, percentage scaling and common presets.
Image format converter
Convert JPEG, PNG and WebP images locally with live previews, quality control and file-size comparison.
HEIC to JPEG converter
Preview HEIC and HEIF photos, choose JPEG quality and download the result without uploading your photo.
Image to text (OCR)
Extract text from photos, screenshots and scans in your browser, then edit it, copy it or save it as a .txt file. Nothing is uploaded.
PDF & documents
9 toolsMerge PDF
Combine multiple PDF files in the selected order, entirely in your browser.
Split PDF
Create separate PDF files from page groups you choose locally.
Images to PDF
Turn JPEG and PNG images into a PDF with selectable page size and order.
PDF to images
Render selected PDF pages as PNG or JPEG images locally.
Rotate PDF
Rotate all or selected PDF pages and download the updated document.
Extract PDF pages
Select pages from a PDF and save them as a new document.
Reorder PDF pages
Change the order of PDF pages with accessible move controls.
PDF metadata viewer
View PDF title, author, dates, page count and other document information.
PDF to Word
Convert PDF files to editable Word documents (.docx) in your browser, with text, formatting and images. Scanned pages are read with OCR.
Guides
- IP addresses explained: IPv4, IPv6 and the reserved rangesWhy there are two kinds of address, why a website sees only one of yours, and the ranges that never appear on the public internet.
- Subnets and CIDR explained: prefixes, masks and usable hostsWhat the number after the slash means, how many hosts each prefix holds, and how to split one network into several.
- DNS records explained: A, AAAA, CNAME, MX, TXT and NSHow a name becomes an address, what each common record type holds, and why a change can take hours to reach everyone.
- Is a website down, or is it just you? How to check, step by stepThe domain, DNS, the IP address and the web server: where a site can fail, how to tell which one, and why a working site can look down.
- HTTP status codes and Cloudflare errors: what 403, 404, 429, 500, 503 and 521 meanThe three-digit code every web server sends: which mean the site works, which mean it refused you, and which mean it is down.
- Unix timestamps and time zones explainedWhat the number behind a date means, how to tell seconds from milliseconds, and why the same instant has a different local time everywhere.
- Counting dates: days between dates, leap years and ISO weeksHow many days lie between two dates, which years are leap years, which week a date falls in, and why the answers are not always what you expect.
- Image formats explained: JPEG, PNG, WebP, AVIF and HEICWhich format to use for what, why an iPhone photo will not open elsewhere, and how to shrink an image without it looking worse.
- Image size explained: pixels, DPI, file size and qualityPixels, DPI and file size are three different things. What each one changes, and how to pick dimensions and quality with measured numbers instead of guesses.
- Phone photos explained: HEIC, EXIF metadata and your privacyA phone photo carries the time, the device and often the exact place it was taken. How to check what yours reveal and remove it before sharing.
- Password strength explained: length, entropy and passphrasesWhy a longer password beats one full of symbols, how strength is counted in bits, and what the 2025 NIST rules changed.
- Hash functions explained: SHA-256, checksums and password hashingWhat makes a hash secure, why MD5 and SHA-1 are retired, how to check a download, and why passwords need a slow, salted hash.
- JSON Web Tokens explained: claims, signatures and safe validationWhat a JWT carries, why decoding is not verifying, the checks a server must make, and the attacks that skip them.
- UUIDs explained: v4, v7 and choosing the right versionHow to read a UUID, why version 4 is random and version 7 sorts by time, and which one suits a database key.
- QR codes explained: capacity, error correction and print sizeHow much a QR code holds, what the four error correction levels do, and how to keep a printed code easy to scan.
- Percentages and VAT explained: adding, removing and stackingWhy you divide to remove VAT, why two discounts don't add up, and the difference between percent and percentage points.
- Common JSON errors and how to fix themTrailing commas, single quotes, comments and other mistakes that break JSON, plus how to read the parser's error message.
- CSV files explained: delimiters, quotes, encoding and ExcelCSV looks like the simplest format there is, yet files break between programs. The rules, the separator and encoding problems, and what Excel changes.
- Text encodings explained: UTF-8, Base64 and URL encodingUTF-8, Base64 and percent-encoding solve three different problems and are easy to mix up. What each one does, with byte-by-byte examples, and which one you need.
- Editing PDFs in the browser: what merging, splitting and converting keepWhat survives a merge, a split or a rotation, how page sizes and resolution work, and what a PDF's metadata says about you.
About nTools
nTools is a collection of small, free tools for everyday jobs: working out VAT or a percentage, checking a domain's DNS records, converting an iPhone photo, merging PDFs or tidying up JSON. Each tool does one thing, opens straight away and needs no account.
Most of them run entirely in your browser. The files, text and numbers you enter are processed on your own device and are not uploaded, which is why the PDF, image and text tools are also fine for documents you would rather not share. The network tools are the exception, because looking up an IP address, a DNS record or a domain registration means asking an outside service.
The site is available in English, Spanish, French, German, Italian and Brazilian Portuguese, with tools made for Brazil such as CPF, CNPJ and Pix. Alongside the tools, the guides explain the ideas behind them, from IP addresses and DNS records to password strength, QR codes and VAT.