Fast, private digital tools running entirely on your computer. Your files and data never touch our servers, and you never have to sign up.
Top calculators, converters, and formatters opened most this week
Calculate monthly mortgage payments (PITI) including principal, interest, property taxes, and home insurance.
Count words, characters (with and without spaces), sentences, paragraphs, and reading time in real-time.
Merge multiple PDF files into a single consolidated document in any order.
Compress JPG, PNG, and WebP images to drastically reduce file size while maintaining visual clarity.
Beautify, indent, format, and inspect JSON payloads with collapsible tree view and error highlighting.
Generate strong, cryptographically secure passwords and passphrases with custom rules.
Generate customizable high-resolution QR codes for websites, text, Wi-Fi networks, and contacts.
Create professional, branded PDF invoices with custom line items, tax rates, payment terms, and client information.
15 focused categories. Jump straight to the task you need done.
Precision calculators for math, personal finance, loans, mortgages, investments, health, and fitness metrics.
Calculate ages, business days, work hours, overtime, time duration between dates, and world timezone conversions.
Format, clean, count, sort, and inspect text. Analyze word counts, convert cases, detect diffs, and generate placeholder copy.
Merge, split, compress, watermark, rotate, protect, and convert PDF documents directly in your web browser securely.
Compress, resize, crop, filter, convert formats, extract colors, inspect EXIF metadata, and generate social media images.
Extract and build ZIP archives, convert CSV, JSON, XML, Markdown, HTML, images, and inspect file hashes and MIME types.
Essential utilities for programmers: code formatters, validators, regex testing, encoders, JWT decoder, and token generators.
Instant conversions for length, weight, temperature, cooking, speed, pressure, energy, and US Customary to Metric units.
Generate high-resolution QR codes, barcodes, cryptographically secure passwords, random data, and CSS styles.
Inspect meta tags, preview Google SERP snippets, analyze keyword density, generate sitemaps, and test site headers.
Generate invoices, receipts, quotes, calculate profit margins, break-even thresholds, freelance rates, and billable hours.
Calculate GPA, weighted grades, exam scores, format citations in APA/MLA, study with Pomodoro timers and flashcards.
Split bills, calculate tips, estimate fuel costs, plan home renovation supplies, scale recipes, and manage pet ages.
Resize assets for YouTube, Instagram, TikTok, and LinkedIn. Generate hashtags, captions, and track character limits.
Evaluate password strength, encrypt and decrypt text, calculate IP subnets, scrub image metadata, and compute hashes.
Handpicked tools for finance, file conversion, and developer tasks
Calculate percentages, percentage increase or decrease, and find what percent one number is of another.
Advanced scientific calculator with trigonometry, logarithms, powers, roots, and constants.
Calculate monthly mortgage payments (PITI) including principal, interest, property taxes, and home insurance.
Simulate long-term investment growth with monthly contributions and annual compound interest.
Calculate restaurant tips, service gratuity, and split the bill evenly between multiple guests.
Calculate Body Mass Index (BMI) using US Customary (lbs, ft/in) or Metric units with CDC classification ranges.
Most online tools upload your files to remote servers. TTech runs locally on your computer.
PDFs, images, spreadsheets, and passwords run inside your browser sandbox. We never see, transmit, or store your inputs.
Calculations and conversions start instantly. No upload queues, no server lag, and no file size timeouts.
Financial, tax, and measurement tools follow IRS tax brackets, standard mortgage formulas, and US customary units.
Exact math, document guidelines, and developer references to verify your numbers.
Learn the exact mathematical formula to calculate percentage increase and decrease between two numbers. Includes worked financial examples, negative number handling, and Excel syntax.
Detailed breakdown of PDF compression techniques. Learn how to downsample high-DPI scan images, strip unreferenced font metadata, and protect document privacy.
Comprehensive breakdown of domain registration data. Learn how to interpret WHOIS records, read ICANN EPP status codes, track redemption periods, and assess domain trust.
Everything you need to know about pricing, privacy, and file handling.
Every tool is 100% free. There are no subscriptions, daily quotas, watermarks, or credit card requirements.
No. File conversions, PDF edits, image resizing, and data formatting execute locally in your browser sandbox using modern Web APIs. Your confidential files never touch our servers.
No. You can open any tool and start working immediately without providing an email address or creating a password.
Yes. All 410 tools adapt to iOS, Android, macOS, and Windows screens.
410 free tools ready in your browser. No signup, no fees, no delays.