Blog
Guides to getting image and PDF work done properly
Short, practical write-ups on the things people actually get stuck on — why a cutout has a halo, how small a photo can go before it falls apart, and which format to send when you don't know what the other end can open.
Image editing essentials
Why your photo says 72 DPI, and how to change it to 300 without losing quality
What DPI really means, how many pixels a 300 DPI print needs, why Windows and Photoshop show different DPI, and how to change it without re-saving the photo.
7 min readRead
Building our tools
How I built an AI YouTube content planner that turns Google Trends into a video plan, and what broke
How I built a free AI YouTube video ideas generator from Google Trends: the model, real speed tests, the SEO checker and the bugs I had to fix.
12 min readRead
Passport photos
How to take and print a 2x2 passport photo at home, plus the ICAO 35×45 mm size other countries use
Take a passport photo with your phone, crop it to 2×2 inches with the right head size, and print it for under a dollar. Covers US and ICAO rules.
7 min readRead
Mortgages
What your mortgage really costs each month: PMI, property tax and insurance, worked out line by line
A $400,000 home worked out line by line: principal, interest, property tax, insurance and PMI, how the down payment changes it, and when PMI ends.
7 min readRead
Background removal
How to convert a JPG to PNG with a transparent background, and why converting alone keeps the white
Converting a JPG to PNG keeps the white background. Here's why, the two free ways to make it transparent, and a real test showing when each one works.
6 min readRead
Tax forms
How to fill out Form W-4 for 2026: every step explained, and how to sign the PDF online
A step-by-step guide to the 2026 Form W-4: filing status, multiple jobs, dependents, other adjustments, exemption and how to fill and sign the PDF online.
6 min readRead
Tax forms
How to fill out and sign a W-9 online for free, line by line
Fill out Form W-9 online without printing: what goes on each line of the March 2024 revision, how to sign it electronically and how to send it safely.
6 min readRead
Barcodes
Barcode types explained: Code 128, EAN-13, UPC-A and Code 39, check digits and how to print them
Compare the main barcode types, learn how a check digit is calculated by hand, when you need GS1 numbers and how to print barcodes that scan.
9 min readRead
QR codes
How to make a QR code that actually scans: size, contrast, error correction, Wi-Fi codes and testing
Why QR codes fail and how to prevent it: data density, error correction levels, contrast, quiet zone, print size, static versus dynamic codes and safe scanning.
9 min readRead
JSON and CSV
Converting JSON to CSV and CSV to JSON without losing data: nesting, types, Excel and quoting
How to flatten nested JSON, handle lists and missing values, keep leading zeros, open the file correctly in Excel and avoid formula injection.
10 min readRead
JSON formatting
JSON formatter vs minifier: when to pretty print, when to minify and what each really costs
Measured file sizes for pretty printed and minified JSON, with gzip and Brotli, plus indentation, key sorting and the round-trip changes that alter your data.
8 min readRead
JSON errors
How to fix invalid JSON: the common errors, what parsers are telling you and how to repair them
Trailing commas, single quotes, unquoted keys and hidden characters explained, with a step-by-step way to find the error in any JSON file and fix it.
9 min readRead
Video size and quality
Video resolution, aspect ratio and bitrate explained: how to size, reshape and budget any video
Pixels, aspect ratios and bitrate explained: work out crops and black bars, estimate file size and pick export settings, with free browser calculators.
8 min readRead
Frame rate
Video frame rates explained: 24, 30 and 60 fps, slow-motion maths and the 180-degree shutter rule
What frame rate means, why 23.976 and 29.97 exist, how to plan slow motion, set shutter speed and convert between frame rates, with a free browser calculator.
8 min readRead
Audio and video
How to extract audio from a video as MP3 or WAV, or remove the sound completely
MP3 or WAV, what bitrate means for file size, and how to extract or remove the audio from a video in your browser without uploading it.
8 min readRead
Frames and thumbnails
How to extract frames from a video as JPG or PNG and turn the best one into a thumbnail
Save one exact frame or a whole series from any video, choose between JPG and PNG, and design a YouTube or Reels thumbnail that stays readable when small.
8 min readRead
GIFs and loops
Video to GIF and GIF to MP4: how to make small, sharp loops and when to use video instead
Why GIFs are so large, how width, frame rate and length control file size, and how to convert video to GIF or GIF to MP4 in your browser with no watermark.
8 min readRead
Video editing basics
How to trim and crop a video online for free, without uploading it or adding a watermark
Learn how trimming and cropping really work, how much picture you keep when changing shape, and how to cut and reframe a video in your browser with no upload.
8 min readRead
Practical mathematics
Percentage and aspect ratio calculations: the common mistakes, with the real numbers
Why a 50% drop needs a 100% rise, why 20% + 10% off is 28%, why the tax shortcut is wrong, and how much a crop to 16:9 or 9:16 really removes.
8 min readRead
Networking & DNS
IP addresses and DNS records explained, with a measured look at how 24 real domains set theirs up
We checked the live DNS of 24 well-known domains: typical TTLs, IPv6 and DNSSEC use, SPF and DMARC, plus private IP ranges and what your IP reveals.
8 min readRead
Video optimization
How to compress a video: what each preset really produces, and why a size target can be missed
We ran two test clips through our video compressor: presets saved 44% to 74%, but a 1 MB target gave 2 MB until we lowered the resolution.
8 min readRead
Audio engineering
Audio bitrate explained: what 32 to 320 kbps really do to file size and the frequencies you keep
We encoded test audio at every common bitrate: file size follows a simple formula, mono is not smaller, and a higher bitrate cannot repair a compressed MP3.
8 min readRead
Investment & compounding
Compound interest in numbers: what time, rate and compounding frequency really do to ₹10,000 a month
We calculated lump sums and monthly investing to see what matters: why starting 5 years late costs ₹1.5 crore, and how little daily compounding adds.
8 min readRead
Loan & EMI calculation
How to calculate EMI and save interest: what rate, tenure and prepayment really cost on a ₹50 lakh loan
Month-by-month numbers on a ₹50 lakh loan: how EMI works, why early EMIs are mostly interest, when prepaying pays off, and flat vs reducing rates.
9 min readRead
Digital signatures
How to sign a PDF online without printing: what the signature adds to the file, and the order that avoids problems
We signed test PDFs with drawn, typed and uploaded signatures: a drawn one adds 3 KB, a phone photo adds 223 KB, and the text stays searchable.
7 min readRead
Document conversion
How to convert PDF to Word: what survives, what turns into plain text, and what is lost (tested on six PDFs)
We ran six PDFs through our PDF to Word tool: every word of text survived, but a table became plain paragraphs and a scanned PDF produced no file.
6 min readRead
Social media graphics
Instagram and YouTube image sizes in 2026: what the platforms state, what we measured, and what gets cropped
YouTube now recommends 3840×2160 thumbnails and only 18% of a banner is safe. Verified limits, real file sizes and crop loss for Instagram shapes.
8 min readRead
Image optimization
Compress images without losing quality: what 13 quality settings did to the same photo
We re-encoded two photos and a screenshot at 13 quality levels. See real file sizes, the best JPG and WebP settings, and how to hit 200 KB.
9 min readRead
PDF organization
How to merge PDF files into one: what we measured about size, duplicates and fillable forms
Merging PDFs is easy, but we found the result is as big as the parts, duplicate pages are kept in full, and a 10-field form lost all 10 fields.
6 min readRead
PDF compression
How to compress a PDF under 200 KB: three PDFs tested, and why a text PDF can get 26 times bigger
We ran a text, a screenshot and a photo PDF through our compressor: image PDFs shrank up to 84% and the text PDF grew. How to hit 200 KB safely.
8 min readRead
Image upscaling
How to upscale an image without losing quality: what AI upscaling does, the size limits, and what it cannot fix
Our upscaler makes images 2× larger in about 19 seconds per megapixel. Limits, print sizes, the file you get back, and why a quality score can mislead.
7 min readRead
Background removal
How to remove the background from an image: what the AI does to your photo, the file you get back, and the limits
How our background remover works (512 px model, full-size output), the 19.9 MB PNG you can get, the 3 MB limit, and tips for product and phone photos.
8 min readRead
OCR and extraction
How to extract text and images from a PDF: when to use OCR, and how scan quality changes the accuracy
We scanned a known page at 14 settings and ran it through our OCR: 150 DPI was perfect, a 5° tilt wrecked 17% of the words, and compression did nothing.
7 min readRead
PDF editing
How to edit PDF pages online: what rotating, extracting, deleting and splitting really do to file size
We tested the page tools on two PDFs: rotate and reorder change nothing, deleting helps only unique pages, and a shared-logo page stayed 98% of the file.
7 min readRead
File formats
JPG, PNG or WebP: what converting really does to file size and transparency
We converted photos, a screenshot and a transparent icon between JPG, PNG and WebP. See real file sizes, what happens to transparency, and which to pick.
8 min readRead
More guides are on the way — covering PDFs, logos and the rest of the toolkit.
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