File conversion guides
Decisions you actually have to make when converting files — which format to pick, what a conversion throws away, and how to avoid the mistakes that quietly ruin an output. Written for Convertek's supported formats, and each guide links straight to the converters it discusses.
PNG to JPG: What You Gain, What You Lose, and When to Keep the PNG
Converting PNG to JPG: why the file shrinks, what happens to transparency, text and logos, and how to pick a quality setting that survives review.
JPG to PDF: Turning Photos into a Document That Prints Correctly
How to combine JPG photos into one PDF: page size, DPI, orientation and compression, and why a poorly sized image prints blurry or cropped.
PDF to JPG: Rendering Pages at a Resolution That Still Reads
Turn PDF pages into JPG images: choosing DPI, handling multipage files, keeping text legible, and knowing when PNG is the better output.
PowerPoint to PDF: Keeping Slides Intact on Someone Else's Machine
Why PowerPoint to PDF changes fonts, animations and video, how to prepare slides for a fixed layout, and when PDF is the wrong format to send.
Excel to CSV: What a Spreadsheet Loses on the Way to Plain Text
Converting XLSX to CSV: one sheet only, formulas become values, date and number formats disappear, and how to keep encoding and leading zeros.
SVG to PNG: Rasterising Vector Art Without Soft Edges
How SVG to PNG conversion works, how to choose the output size, and why fonts, filters and external assets are the usual reasons a render looks wrong.
MP3 vs WAV vs FLAC: Choosing an Audio Format That Fits the Job
When to use MP3, WAV, FLAC, AAC or OGG, what bitrate and sample rate actually buy you, and why converting lossy audio to lossless is pointless.
Favicons and App Icons: Making an ICO That Every Browser Displays
What an ICO file really contains, which sizes browsers and phones ask for, and why a favicon that looks fine in the tab is unreadable on a bookmark bar.
MOV to MP4: Making iPhone and Mac Video Play Everywhere
Why MOV files fail on Windows, Android and the web, when a MOV to MP4 conversion can copy the video untouched, and when it must re-encode.
EPUB vs PDF: Which eBook Format to Convert To, and What Breaks
EPUB reflows and PDF does not. What each format preserves, why PDF to EPUB conversion is approximate, and which one to send to readers.
HEIC to JPG: Why iPhone Photos Refuse to Open, and What Converting Changes
Why HEIC photos from an iPhone fail to open on Windows, Android and older software, what a JPG conversion keeps or discards, and how to avoid quality loss.
Photos and Scans to PDF: Page Size, DPI and Ordering Done Right
Turn phone photos, receipts and scans into one PDF that prints correctly — how page size, resolution, rotation and compression decide the result.
PDF to JPG or PNG: Choosing a Resolution That Is Neither Blurry nor Huge
What 72, 150 and 300 DPI actually mean for a PDF page, when PNG beats JPG, and why one page can produce a file larger than the document it came from.
DOCX to PDF: Why the Layout Moves, and the Checks That Catch It
Fonts, fields and page breaks are what change when a Word file becomes a PDF — how to predict the damage and catch it in three minutes before sending.
MP4, WebM and MKV: Choosing a Video Format That Actually Plays
Containers versus codecs, which format plays where, and what a video conversion really costs — a practical guide to MP4, WebM, MKV and MOV.
Choosing the Right Image Format: PNG, JPG, WebP, AVIF and SVG
A practical guide to picking between PNG, JPG, WebP, AVIF, GIF and SVG — what each format compresses, what it throws away, and when to convert.
PDF to DOCX: How to Convert a PDF Without Wrecking the Layout
What actually happens when a fixed-layout PDF becomes an editable DOCX, which elements survive, which break, and how to get a document you can keep working in.
How to Extract Audio from a Video: MP4, MOV, MKV to MP3 or WAV
Turn the soundtrack of any video into a standalone audio file — which output format to pick, what happens to quality, and how long it takes.
CSV vs JSON vs XML: Which Data Format Should You Use?
When flat rows beat nested structures, when they do not, and how to move a dataset between CSV, JSON, XML and spreadsheet formats without losing meaning.
Making Files Smaller: Compression, Conversion and What Actually Works
Why some files compress dramatically and others will not budge — lossless vs lossy, archive formats, and the conversions that genuinely reduce size.
SRT vs VTT: Converting Subtitles Without Breaking the Timing
The difference between SRT, VTT, ASS and SBV subtitle files, how timing and styling survive a conversion, and how to fix captions that drift.
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Every guide ends in a converter — or start from the full format directory.