# Alventra.io

> Alventra.io is a free website with 40+ browser-based tools for images, PDFs, text, calculations, development and dates. Every tool runs entirely in the user's browser, so files and text are never uploaded. No sign-up, no limits.

- Built and maintained by Muhammad Irfan Liaqat, a software engineer.
- All processing is client-side JavaScript: images, PDFs and text stay on the user's device.
- Every tool is free and needs no account.
- Contact: contact@alventra.io (general), support@alventra.io (bugs), ideas@alventra.io (tool requests).
- Sitemap with every URL: https://alventra.io/sitemap.xml
- Full content of this site in one file: https://alventra.io/llms-full.txt

## Image Tools

- [Image to Text (OCR)](https://alventra.io/tools/image-to-text): Extract text from images using OCR. Supports JPG, PNG, WebP, and more.
- [Image Compressor](https://alventra.io/tools/image-compressor): Compress images to reduce file size while maintaining quality.
- [Image Resizer](https://alventra.io/tools/image-resizer): Resize images to any dimension. Maintain aspect ratio or set custom sizes.
- [Image Format Converter](https://alventra.io/tools/image-converter): Convert images between PNG, JPG, WebP, and BMP formats.
- [Image Cropper](https://alventra.io/tools/image-cropper): Crop images to any size with a visual editor. Download instantly.
- [Image to Base64](https://alventra.io/tools/image-to-base64): Convert any image to a Base64 encoded string for embedding in code.
- [Background Remover](https://alventra.io/tools/background-remover): Remove image backgrounds instantly. Download transparent PNG files for free.

## PDF Tools

- [Merge PDF](https://alventra.io/tools/merge-pdf): Combine multiple PDF files into one document. Fast and free.
- [Images to PDF](https://alventra.io/tools/images-to-pdf): Convert multiple images into a single PDF document.

## Text Tools

- [Word & Character Counter](https://alventra.io/tools/word-counter): Count words, characters, sentences, and paragraphs in your text instantly.
- [Case Converter](https://alventra.io/tools/case-converter): Convert text to uppercase, lowercase, title case, sentence case, and more.
- [Lorem Ipsum Generator](https://alventra.io/tools/lorem-ipsum-generator): Generate placeholder text for your designs and layouts.
- [Text to Slug](https://alventra.io/tools/text-to-slug): Convert any text into a URL-friendly slug instantly.
- [Remove Duplicate Lines](https://alventra.io/tools/remove-duplicate-lines): Remove duplicate lines from your text and keep only unique entries.
- [Markdown Preview](https://alventra.io/tools/markdown-preview): Write Markdown and see a live preview side by side. Export to HTML.
- [Text Diff Checker](https://alventra.io/tools/diff-checker): Compare two texts and see the differences highlighted line by line.
- [CSV to JSON](https://alventra.io/tools/csv-to-json): Convert CSV data to JSON format instantly. Supports custom delimiters.

## Calculators

- [Scientific Calculator](https://alventra.io/tools/scientific-calculator): Full-featured scientific calculator with trigonometry, logarithms, and more.
- [Age Calculator](https://alventra.io/tools/age-calculator): Calculate your exact age in years, months, days, hours, and minutes.
- [Percentage Calculator](https://alventra.io/tools/percentage-calculator): Find X% of a number, what percent one number is of another, and percentage change.
- [BMI Calculator](https://alventra.io/tools/bmi-calculator): Calculate your Body Mass Index in metric or imperial units and see your BMI category.
- [Loan EMI Calculator](https://alventra.io/tools/loan-emi-calculator): Calculate the monthly EMI, total interest and total repayment for any loan.
- [Discount Calculator](https://alventra.io/tools/discount-calculator): Enter a price and a percentage off to get the sale price and how much you save.
- [Compound Interest Calculator](https://alventra.io/tools/compound-interest): Calculate compound interest with monthly, quarterly, or yearly compounding.
- [Tip Calculator](https://alventra.io/tools/tip-calculator): Calculate tip amount and split the bill between multiple people.

## Generators

- [QR Code Generator](https://alventra.io/tools/qr-code-generator): Make QR codes for links, text, Wi-Fi, email and phone numbers. Download PNG or SVG.
- [Password Generator](https://alventra.io/tools/password-generator): Generate strong, secure passwords with customizable length and characters.
- [Hash Generator](https://alventra.io/tools/hash-generator): Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes from any text.
- [Color Palette Generator](https://alventra.io/tools/color-palette): Build color palettes from one base color using color-wheel rules. Copy HEX codes.
- [Invoice Generator](https://alventra.io/tools/invoice-generator): Create professional invoices and download them as PDF. Free and easy.

## Developer

- [JSON Formatter](https://alventra.io/tools/json-formatter): Format, validate and minify JSON, with clear error messages for invalid input.
- [Base64 Encode/Decode](https://alventra.io/tools/base64): Encode text to Base64 or decode Base64 strings instantly.
- [Color Picker & Converter](https://alventra.io/tools/color-picker): Pick colors and convert between HEX, RGB, and HSL formats.
- [Regex Tester](https://alventra.io/tools/regex-tester): Test regular expressions against text with real-time match highlighting.
- [HTML Encode/Decode](https://alventra.io/tools/html-encode-decode): Encode special characters to HTML entities or decode them back.
- [JWT Decoder](https://alventra.io/tools/jwt-decoder): Decode and inspect JWT tokens. View header, payload, and expiration.

## Date & Time

- [Date Difference Calculator](https://alventra.io/tools/date-difference): Find the exact difference between two dates in years, months, and days.
- [Add or Subtract Days](https://alventra.io/tools/add-subtract-days): Add or subtract days, weeks, months, or years from any date.
- [Countdown Timer](https://alventra.io/tools/countdown-timer): Create a countdown to any date and see the time remaining live.
- [Age in Detail](https://alventra.io/tools/age-in-detail): Know your age broken down into months, weeks, days, hours, and seconds.

## Converters

- [Unit Converter](https://alventra.io/tools/unit-converter): Convert between length, weight, temperature, and more common units.

## Game Tools

- [Palworld Breeding Calculator](https://alventra.io/tools/palworld-breeding-calculator): See what any two pals hatch into, every parent pair for a pal, and the shortest breeding path. Palworld 1.0 data.

## Date Answers

- [Days Until (holiday countdowns)](https://alventra.io/days-until): Live countdowns to 48 holidays and events, including Christmas, Ramadan, Eid, Diwali and New Year.
- [Week Number](https://alventra.io/week-number): Today's ISO week number and the week numbers of every week in the year.
- [Days From Today](https://alventra.io/days-from-today/1): What date is N days from today, for N = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 35, 40, 45, 50, 60, 70, 75, 80, 90, 100, 120, 150, 180, 200, 270, 300, 365, 500, 1000. URL pattern: /days-from-today/{N}.
- [Weeks From Today](https://alventra.io/weeks-from-today/1): What date is N weeks from today, for N = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 24, 26, 30, 36, 40, 52. URL pattern: /weeks-from-today/{N}.
- [Days Ago](https://alventra.io/days-ago/7): What date was N days ago, for N = 7, 10, 14, 15, 20, 21, 28, 30, 45, 60, 90, 100, 120, 150, 180, 200, 365. URL pattern: /days-ago/{N}.
- [Yearly Calendars](https://alventra.io/calendar/2026): Full calendar with holidays for 2026–2028. URL pattern: /calendar/{year}.
- [How Old Am I](https://alventra.io/how-old/2025): Age, generation and zodiac animal for someone born in 1940–2025. URL pattern: /how-old/{year}.

## Guides

- [How to Calculate Percentages: The Complete Guide](https://alventra.io/blog/percentage-calculator-guide-how-to-calculate-percentages): Learn how to calculate percentages the easy way. Covers percentage of a number, percentage change, percentage difference, and tips you can use every day.
- [How Age Is Calculated: Years, Months and Days](https://alventra.io/blog/age-calculator-find-exact-age-years-months-days): Calculate your exact age from your date of birth. Learn how age calculators work, why your age varies by counting method, and practical uses beyond birthdays.
- [How to Count Days Between Two Dates](https://alventra.io/blog/date-calculator-days-between-dates-add-subtract): Calculate the number of days between two dates or add and subtract days from any date. Covers business days, date math tricks, and common deadline calculations.
- [How Much to Tip, and How to Split the Bill](https://alventra.io/blog/tip-calculator-how-to-calculate-tips-split-bills): Learn how to calculate tips fast, when to tip more or less, and how to split bills evenly. Includes tipping percentages for restaurants, delivery, and services.
- [How to Work Out Discounts and Sale Prices](https://alventra.io/blog/discount-calculator-sale-price-savings-guide): Learn how to calculate discounts, find sale prices, and compare deals. Covers stacking discounts, unit pricing, and common retail math traps to avoid.
- [Metric vs Imperial: A Unit Conversion Guide](https://alventra.io/blog/unit-converter-guide-length-weight-temperature): Convert between metric and imperial units for length, weight, temperature, and more. Quick reference tables, mental math tricks, and a free converter tool.
- [Create Professional Invoices for Free (No Excel)](https://alventra.io/blog/create-professional-invoices-free-no-excel): Stop wrestling with spreadsheets or paying for invoicing software. Here's how to create clean, professional invoices in your browser — free, private, and fast.
- [How to Pick Colors That Actually Work Together](https://alventra.io/blog/how-to-pick-colors-that-work-together): Stop guessing with colors. Learn the 60-30-10 rule, five color relationships that always work, and how to build a palette you won't regret in six months.
- [Convert Images to WebP: A Complete Guide](https://alventra.io/blog/convert-images-to-webp-format-guide): WebP images are smaller and load faster. Learn how to convert PNG, JPG, and BMP files to WebP for free, with no software to install.
- [Remove Image Backgrounds for Free](https://alventra.io/blog/remove-image-background-free-without-photoshop): Remove backgrounds from photos in seconds — right in your browser. No software, no account, no upload to sketchy servers. Here's exactly how to do it.
- [7 Best TinyPNG Alternatives (2026)](https://alventra.io/blog/best-tinypng-alternatives-free-image-compressors): Tired of TinyPNG's upload limits and privacy concerns? Here are 7 free image compressors compared on limits, control, and where your files go.
- [5 Best iLovePDF Alternatives (2026)](https://alventra.io/blog/best-ilovepdf-alternatives-free-pdf-tools): iLovePDF keeps hitting you with daily limits and sign-up prompts? Here are 5 free PDF tools compared on limits, privacy, and what they can do.
- [Resize Images for Social Media (2026)](https://alventra.io/blog/resize-images-for-social-media-2026-guide): Every social platform wants different image sizes. A no-nonsense guide to getting photos and graphics sharp on Instagram, Facebook, LinkedIn & X.
- [SEO-Friendly URLs: Why They Matter](https://alventra.io/blog/seo-friendly-urls-why-they-matter): Messy URLs confuse search engines and visitors. Learn how to create clean, readable URL slugs that people and search engines understand at a glance.
- [Compress Images Without Losing Quality](https://alventra.io/blog/how-to-compress-images-without-losing-quality): Learn practical techniques to reduce image file size while keeping them sharp. A simple guide for website owners, bloggers, and designers.
- [What Is a QR Code? Free Creation Guide](https://alventra.io/blog/what-is-a-qr-code-how-to-create-one-free): Everything you need to know about QR codes — what they are, how they work, and how to generate your own in seconds. No app needed.
- [Create Strong Passwords You Remember](https://alventra.io/blog/create-strong-passwords-that-you-can-remember): Practical advice on building secure passwords without going crazy. Plus tips on password managers and why length beats complexity.
- [JSON Formatting Guide for Beginners](https://alventra.io/blog/json-formatting-guide-for-beginners): A beginner-friendly explanation of JSON — the data format that powers the modern web. Learn to read, write, and format JSON like a pro.
- [Compound Interest Explained Simply](https://alventra.io/blog/compound-interest-explained-simply): A simple, jargon-free explanation of compound interest with real examples. See how starting early can turn small savings into serious wealth.
- [Extract Text from Images with OCR](https://alventra.io/blog/how-to-extract-text-from-images-ocr): Learn how to pull text out of photos, screenshots, and scanned documents using free OCR tools. No software installation required.
- [Is It Safe to Merge PDFs Online? How to Stay Private](https://alventra.io/blog/merge-pdf-files-free-guide): Most online PDF mergers upload your files to a server. Here's how to combine PDFs in your browser instead, with tips on page order, size and email limits.
- [Base64 Encoding: What It Is and Why](https://alventra.io/blog/base64-encoding-explained-when-to-use-it): A clear, practical explanation of Base64 encoding for developers and curious minds. Learn what it does, why it exists, and when you actually need it.

## Site

- [All Tools](https://alventra.io/tools): Every tool on one page.
- [Blog](https://alventra.io/blog): How-to guides for the tools.
- [About](https://alventra.io/about): Who runs the site and how tools handle data.
- [Contact](https://alventra.io/contact)
- [Privacy Policy](https://alventra.io/privacy)
- [Terms of Service](https://alventra.io/terms)

## Optional

- [Image Tools category](https://alventra.io/category/image)
- [PDF Tools category](https://alventra.io/category/pdf)
- [Text Tools category](https://alventra.io/category/text)
- [Calculators category](https://alventra.io/category/calculators)
- [Generators category](https://alventra.io/category/generators)
- [Developer category](https://alventra.io/category/developer)
- [Date & Time category](https://alventra.io/category/date-time)
- [Converters category](https://alventra.io/category/converters)
- [Game Tools category](https://alventra.io/category/games)
- [Days until Christmas](https://alventra.io/days-until/christmas): Christmas is celebrated every year on December 25.
- [Days until New Year's Day](https://alventra.io/days-until/new-year): New Year's Day is January 1 every year.
- [Days until Halloween](https://alventra.io/days-until/halloween): Halloween falls on October 31 every year.
- [Days until Thanksgiving](https://alventra.io/days-until/thanksgiving): US Thanksgiving is the fourth Thursday of November, so it lands between November 22 and 28.
- [Days until Valentine's Day](https://alventra.io/days-until/valentines-day): Valentine's Day is February 14 every year.
- [Days until Easter](https://alventra.io/days-until/easter): Easter is the first Sunday after the first full moon on or after March 21, so it falls between March 22 and April 25.
- [Days until Black Friday](https://alventra.io/days-until/black-friday): Black Friday is the day after US Thanksgiving — the fourth Friday of November.
- [Days until Cyber Monday](https://alventra.io/days-until/cyber-monday): Cyber Monday is the Monday after US Thanksgiving.
- [Days until New Year's Eve](https://alventra.io/days-until/new-years-eve): New Year's Eve is December 31, the last day of the year.
- [Days until Christmas Eve](https://alventra.io/days-until/christmas-eve): Christmas Eve is December 24, the day before Christmas.
- [Days until Ramadan](https://alventra.io/days-until/ramadan): Ramadan starts on the first day of the ninth month of the Islamic calendar. Because that calendar is lunar, Ramadan begins about 11 days earlier each year.
- [Days until Eid al-Fitr](https://alventra.io/days-until/eid-al-fitr): Eid al-Fitr is the first day of Shawwal, the month after Ramadan, and is confirmed by the sighting of the new moon.
- [Days until Eid al-Adha](https://alventra.io/days-until/eid-al-adha): Eid al-Adha falls on the 10th of Dhul Hijjah, the last month of the Islamic calendar, during the Hajj pilgrimage.
- [Days until Diwali](https://alventra.io/days-until/diwali): Diwali falls on the new-moon night (Amavasya) of the Hindu month of Kartika, usually in October or November.
- [Days until Chinese New Year](https://alventra.io/days-until/chinese-new-year): Chinese New Year falls on the second new moon after the winter solstice, between January 21 and February 20.
- [Days until Hanukkah](https://alventra.io/days-until/hanukkah): Hanukkah begins at sundown on the eve of the 25th of Kislev in the Hebrew calendar and lasts eight nights. The date shown is the evening the first candle is lit.
- [Days until Good Friday](https://alventra.io/days-until/good-friday): Good Friday is the Friday before Easter Sunday.
- [Days until Palm Sunday](https://alventra.io/days-until/palm-sunday): Palm Sunday is the Sunday before Easter, one week before Easter Sunday.
- [Days until Ash Wednesday](https://alventra.io/days-until/ash-wednesday): Ash Wednesday is 46 days before Easter Sunday and marks the start of Lent.
- [Days until Mardi Gras](https://alventra.io/days-until/mardi-gras): Mardi Gras (Fat Tuesday) is the day before Ash Wednesday, 47 days before Easter.
- [Days until St. Patrick's Day](https://alventra.io/days-until/st-patricks-day): St. Patrick's Day is March 17 every year.
- [Days until 4th of July](https://alventra.io/days-until/4th-of-july): US Independence Day is July 4 every year.
- [Days until Memorial Day](https://alventra.io/days-until/memorial-day): Memorial Day is the last Monday of May.
- [Days until Labor Day](https://alventra.io/days-until/labor-day): US Labor Day is the first Monday of September.
- [Days until Mother's Day](https://alventra.io/days-until/mothers-day): Mother's Day in the US is the second Sunday of May.
- [Days until Father's Day](https://alventra.io/days-until/fathers-day): Father's Day in the US is the third Sunday of June.
- [Days until Juneteenth](https://alventra.io/days-until/juneteenth): Juneteenth is June 19 every year.
- [Days until Martin Luther King Jr. Day](https://alventra.io/days-until/mlk-day): MLK Day is the third Monday of January, close to Dr. King's birthday on January 15.
- [Days until Presidents' Day](https://alventra.io/days-until/presidents-day): Presidents' Day (Washington's Birthday) is the third Monday of February.
- [Days until Veterans Day](https://alventra.io/days-until/veterans-day): Veterans Day is November 11 every year.
- [Days until Columbus Day](https://alventra.io/days-until/columbus-day): Columbus Day, also observed as Indigenous Peoples' Day, is the second Monday of October.
- [Days until Super Bowl](https://alventra.io/days-until/super-bowl): Since the NFL moved to a 17-game season, the Super Bowl is scheduled for the second Sunday of February.
- [Days until Pakistan Independence Day](https://alventra.io/days-until/pakistan-independence-day): Pakistan's Independence Day is August 14 every year.
- [Days until Pakistan Day](https://alventra.io/days-until/pakistan-day): Pakistan Day (Pakistan Resolution Day) is March 23 every year.
- [Days until India Independence Day](https://alventra.io/days-until/india-independence-day): India's Independence Day is August 15 every year.
- [Days until India Republic Day](https://alventra.io/days-until/india-republic-day): India's Republic Day is January 26 every year.
- [Days until Canada Day](https://alventra.io/days-until/canada-day): Canada Day is July 1 every year.
- [Days until Boxing Day](https://alventra.io/days-until/boxing-day): Boxing Day is December 26, the day after Christmas.
- [Days until April Fools' Day](https://alventra.io/days-until/april-fools-day): April Fools' Day is April 1 every year.
- [Days until Earth Day](https://alventra.io/days-until/earth-day): Earth Day is April 22 every year.
- [Days until Groundhog Day](https://alventra.io/days-until/groundhog-day): Groundhog Day is February 2 every year.
- [Days until Cinco de Mayo](https://alventra.io/days-until/cinco-de-mayo): Cinco de Mayo is May 5 every year.
- [Days until Spring](https://alventra.io/days-until/spring): Astronomical spring in the Northern Hemisphere begins at the March equinox, on March 19, 20, or 21.
- [Days until Summer](https://alventra.io/days-until/summer): Astronomical summer in the Northern Hemisphere begins at the June solstice, on June 20 or 21.
- [Days until Fall (Autumn)](https://alventra.io/days-until/fall): Astronomical fall in the Northern Hemisphere begins at the September equinox, on September 22 or 23.
- [Days until Winter](https://alventra.io/days-until/winter): Astronomical winter in the Northern Hemisphere begins at the December solstice, on December 21 or 22.
- [Days until Daylight Saving Time Start](https://alventra.io/days-until/dst-starts): In the US and Canada, daylight saving time starts at 2:00 a.m. on the second Sunday of March, when clocks move forward one hour.
- [Days until Daylight Saving Time End](https://alventra.io/days-until/dst-ends): In the US and Canada, daylight saving time ends at 2:00 a.m. on the first Sunday of November, when clocks go back one hour.