How to compress an image to 100KB, 200KB or a specific size
Learn how file size, dimensions and image quality interact, then compress JPG, PNG or WebP files to a target KB or MB in your browser.
The only online file toolkit you need
JustFileKit is a completely free online PDF and image toolkit with no installation or account required. Every file is processed locally in your browser and is never uploaded to a server.
No sign-up needed — just drop a file and go
Drop your files here
Click to choose a file
Supported: PDF · JPG · PNG · WebP · MP4
Up to 50 files and 100 MB total per batch
Up to 50 MB per file
What is JustFileKit?
JustFileKit includes PDF merge, split, compression, page reordering, rotation and deletion tools, plus image compression, conversion, cropping and resizing. Every live tool has unlimited runs, supports files up to 50 MB, and can handle batches of up to 50 files. Because the computation happens on your own device, sensitive contracts, IDs and photos do not need to leave it.
How do I use JustFileKit for free?
- 1.Drop a PDF or a JPG, PNG or WebP image
- 2.Choose a tool and its processing options
- 3.Process locally, then download the result
Zero storage
Compression, grayscale and more run entirely in your browser — your files are never uploaded to any server
No installation
Works in your browser with no software to download
Nine languages
Available in Traditional Chinese, English, Japanese, Spanish, Brazilian Portuguese, German, French, Dutch and Italian
How tools, content and results are checked
JustFileKit explains processing methods, limitations and evidence as well as providing the interface, so you can decide whether a result fits your purpose.
Verifiable file processing
Files are processed in the browser. Tool pages state re-encoding, quality, selectable-text and format limitations.
Sourced calculation methods
Important financial calculators identify assumptions, official sources, review dates and costs or eligibility factors they do not include.
A public correction path
Code changes can be followed in the public repository, and reproducible issues can be reported with the page URL and input assumptions.
Join as a free member
Get important tool and feature updates, and create your account ahead of future member features. Updates are optional.
PDF Tools
Merge PDF
Combine several PDFs into one
Compress PDF
Shrink your PDF file size
Organize PDF Pages
Reorder, rotate or remove pages in one place
Split PDF
Extract selected pages from a PDF
More PDF tools (7)
Fill & Annotate PDF
Add text, dates, checks and images with draggable placement
PDF to Grayscale
Turn color PDFs grayscale or pure B&W to save ink
PDF Watermark
Add a text watermark to protect your documents
Add Page Numbers to PDF
Place page numbers at the top or bottom of every page
Visually Sign PDF
Type or draw a visible signature on a PDF
PDF to Image
Export PDF pages as images
PDF File Padding
Increase file size without changing content
Image Tools
Compress Image
Choose a percentage or a target size in KB or MB
Convert Format
Convert between JPG, PNG and WebP
Resize Image
Scale image resolution up or down
Crop Image
Crop images to any area you choose
More image tools (8)
Image Redaction & Pixelation
Cover sensitive areas and preview the flattened PNG
Image Combiner & Collage
Join images vertically, horizontally or in a grid; reorder by dragging
HEIC to JPG
Convert iPhone HEIC photos to widely supported JPG files
Image to Grayscale
Turn color images grayscale
Image Watermark
Add a text watermark to your images
Image to PDF
Combine multiple images into one PDF
Image File Padding
Increase file size without changing content
Batch Rename Images
Rename lots of images to formats like app_01
Video Tools
Calculators
Choose mortgage and loan calculators by country. Every tool explains its method, regional scope, source material and important limits.
Mortgage and home-loan calculators
Browse mortgage calculators by countryHong KongHong Kong mortgage calculatorEstimate HKD repayments, total interest, yearly balances and a second-rate scenario.CanadaCanada mortgage stress testEstimate the qualifying rate, GDS, TDS and maximum mortgage amount.United StatesU.S. mortgage payment calculatorEstimate principal, interest, taxes, insurance, PMI, HOA and the monthly ownership budget.AustraliaAustralian home loan repayment calculatorEstimate repayments, LVR, a rate-rise scenario, ownership costs and extra-repayment savings.United KingdomUK mortgage repayment calculatorEstimate repayments, product-fee interest, home costs, a comparison rate and overpayment savings.New ZealandNew Zealand mortgage repayment calculatorEstimate table-loan repayments, LVR, simplified DTI, home costs and extra-repayment savings.IrelandIreland mortgage repayment calculatorEstimate repayments, LTV and LTI comparisons, stamp duty, home costs and extra-repayment savings.SingaporeSingapore mortgage calculatorEstimate SGD monthly repayments, total interest, yearly balances and a second-rate scenario.MalaysiaMalaysia home loan calculatorEstimate MYR instalments, total interest, yearly balances and extra-payment savings.IndiaIndia home loan EMI calculatorCalculate INR EMI, total interest, yearly balances and extra-payment savings.
Document tools
Latest guides
Practical answers for PDF and image workflows, format decisions and file privacy.
How to convert HEIC to JPG on Windows without uploading photos
Convert iPhone HEIC photos to compatible JPG files locally in your browser, with practical notes about quality, metadata and privacy.
How to add page numbers to a PDF without Acrobat
Add page numbers to a PDF in the browser, with control over the header or footer position, starting number and current/total format.