Tools that just work
Dozens of handy online tools for PDFs, images, text, passwords and domains. Everything runs right in your browser — no file uploads, no sign-up, free.
PDF documents
Merge, split, rotate, delete pages or reorder them, compress, convert images to PDF and PDF to images, and strip metadata — no server upload.
Merge PDF
Combine several PDF files into one right in your browser.
Split PDF (pick pages)
Pick specific pages from a PDF and download them as a new file.
Delete pages from PDF
Remove selected pages from a PDF and download the new document.
Reorder PDF pages
Change the page order of a PDF: move, reverse or type a new order.
Rotate PDF
Rotate all pages of a PDF by 90, 180 or 270 degrees and download.
Compress PDF (reduce size)
Reduce the size of a PDF right in your browser.
Images to PDF (JPG, PNG, WebP → PDF)
Convert JPG, PNG, WebP, BMP or GIF images into a single PDF.
PDF to images (PDF → JPG / PNG)
Convert PDF pages to JPG or PNG images at a chosen resolution.
Remove metadata from PDF
Strip author, title, keywords, creation dates and XMP metadata from a PDF.
Images and colors
Shrink file size, resize, convert format, work with color codes and check WCAG contrast.
Image compression
Reduce the file size of a JPG, PNG or WebP image right in your browser.
Resize image
Change an image's width and height right in your browser.
Image format conversion
Convert an image between JPG, PNG and WebP right in your browser.
Color converter (HEX ↔ RGB)
Convert a color between HEX and RGB with a preview.
Color contrast (WCAG)
Check the contrast ratio of text and background against WCAG (AA, AAA).
Passwords and security
Generate a strong password, test an existing one, compute a hash, create a UUID or random strings for tokens and codes.
Strong password generator
Create a strong random password right in your browser.
Password Strength
Check your password strength free in the browser.
Hash generator
Generate a hash of text (SHA-256, SHA-1, SHA-512) right in your browser.
UUID generator
Generate random version-4 UUIDs.
Random string generator
Generate random strings of a chosen length – for tokens, API keys, codes or test data.
Working with text
Convert to upper/lower case, remove accents, make a URL slug, count characters or standard pages, check word frequency, compare two texts or generate Lorem Ipsum.
Character and word counter
Count characters, words, sentences and paragraphs in your text instantly and for free.
Standard page calculator
Count standard pages (1,800 characters), author sheets, characters and words in a text.
Uppercase & lowercase
Convert text to UPPERCASE, lowercase, Sentence case or Title Case.
Remove diacritics
Strip accents and diacritics from text in one click (ěščřž → escrz).
Slugify and Accent Remover
Free tool to turn text into a clean URL slug: lowercase, no accents, hyphens instead of spaces.
Word Frequency Counter
Count word frequency in any text free, right in your browser.
Text comparison (diff)
Compare two texts and highlight added and removed lines.
Lorem ipsum generator
Generate Lorem ipsum placeholder text with a chosen number of paragraphs.
Encoding and data
Base64, URL encode/decode, HTML entities, JSON formatting, Markdown preview and number base conversion — the basic developer toolkit.
Base64 — encode and decode
Encode or decode text to/from Base64.
URL encode / decode
Encode or decode text for use in a URL (percent-encoding).
HTML entities — encode and decode
Convert special characters (<, >, &, quotes, accents) to HTML entities and back.
JSON formatter and validator
Format and validate JSON (pretty-print) right in your browser.
Markdown viewer
Open an .md file or paste Markdown and see a formatted preview.
Number base converter
Convert numbers between binary, octal, decimal and hexadecimal.
Conversions and calculations
Units, time, percentages, Roman numerals, dates, age, days between dates and BMI.
Unit converter
Convert length, weight, temperature and volume between units.
Time / Unix Timestamp Converter
Convert a Unix timestamp (seconds or milliseconds) to a readable date and back.
Percentage calculator
Calculate percentages: what is X% of Y, X is what % of Y, percentage change.
Roman numeral converter
Convert Arabic numbers to Roman numerals and back (1–3999).
Date calculator
Compute a date after adding or subtracting a number of days.
Age calculator
Calculate exact age from a date of birth — years, months and total days.
Days Between Dates
Calculate the number of days and weeks between two dates for free.
BMI calculator
Calculate your BMI (body mass index) from height and weight.
Generators and print
QR code, calendar event (ICS), a printable envelope address and diplomas or certificates as PDF.
QR code generator
Create a QR code from a link or text and download it.
ICS generator (calendar event)
Create an .ics calendar event file for Google Calendar, Outlook or Apple Calendar.
Envelope address (print template)
Fill in sender and recipient, pick an envelope size (DL, C6, C5, C4) and print or save as PDF.
Diploma & certificate generator
Create a diploma, certificate, commendation or gift voucher.
Family and kids
A task board for kids with pictures and a big red/green switch — a daily routine (morning, evening) for a tablet, no sign-up needed.
SEO and domains
Check a domain's DNS records including SPF, DMARC and DKIM — verify your e-mail setup.
Why Nástrojárna?
- 🔒 Privacy first. Files are processed on your device and sent nowhere.
- ⚡ Lightning fast. No waiting on a server — you get the result instantly.
- 🆓 Free, no account. Open it, use it, done.
- 🧩 47 tools in one place. From PDF to images to generators — no need to search elsewhere.