Guides and tutorials
Practical write-ups on working with PDFs and images — what the formats actually do, and which settings matter.
How many pages fit under 100 KB, 200 KB, 500 KB or 1 MB?
We built test PDFs of 1 to 12 scanned pages and fitted each under five size limits. The table shows what is possible, what one page costs at each resolution, and when a limit is out of reach.
Is iLovePDF safe? What actually happens to your file
A straight answer, using iLovePDF's own published statements: what it does with your file, how long it keeps it, the five-year exception, and when to use something else.
iLovePDF alternatives that never upload your file
iLovePDF processes your file on its servers and deletes it within two hours. Some alternatives never send it at all. Here is the difference, and when it matters.
JPEG, PNG, WebP or AVIF: Which Image Format Should You Use?
What each web image format is good at, when transparency or animation matters, and simple rules for choosing between JPEG, PNG, WebP and AVIF.
How Much Can You Compress an Image Before It Looks Bad?
What quality settings really mean, why photos and flat graphics behave differently, and a step-by-step way to find the lowest quality that still looks clean.
Resizing Images for Social Media and Print, Without the Guesswork
Pixels, aspect ratios and print sizes are three separate ideas. Here is how to calculate the size you need and resize or crop to it cleanly.
Lossy vs Lossless Image Compression: What Actually Changes
Lossless keeps every pixel; lossy throws some information away on purpose. Learn how JPEG does it, why repeated saves degrade a file, and when each is right.
Why Images Slow Down Your Website and How to Fix It
Oversized dimensions, the wrong format and missing size attributes are the usual causes of slow, jumpy pages. Here is how to spot each one and fix it.
How to Convert HEIC Photos from Your iPhone to JPG or PNG
What HEIC is, why it will not open everywhere, how to switch the iPhone to JPEG, and what to expect when converting in your browser.
Remove Image Metadata Before You Share a Photo
Photos often carry hidden details: camera model, date, and sometimes exact GPS coordinates. Here is what EXIF is, how to check it, and how to strip it in your browser.
Batch Process Images in Your Browser, No Desktop Software
When a whole folder needs the same resize, compression, conversion or watermark, a browser batch tool can do it. Here is how to plan a batch, its memory limits, and where desktop software still wins.
How to Merge PDF Files: Order, Page Sizes and What Survives
Combining PDFs is easy; getting a clean result takes a little planning. Ordering, mixed page sizes, links and forms, and file size all matter.
Compress a PDF Without Losing Quality: What Works and What Doesn't
PDFs get big for specific reasons. Here is what actually makes them large, what our Compress PDF tool does and does not do, and practical ways to shrink one.
How to OCR a PDF: Scans, Accuracy and What You Get
OCR turns a picture of text into real text. Here is how it works, what makes a scan easy to read, and what the Synthixx OCR tool does and does not produce.
PDF vs Word: When to Keep the PDF and When to Convert
PDF and Word solve different problems. Learn when each format fits, what converters really do, and how the Synthixx conversion tools behave in practice.
A Guide to the PDF Tools on Synthixx and What Each Does Well
Every PDF tool on Synthixx grouped by job, with one honest sentence on each, its main limitation, and a clear list of what the site does not offer.