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Smart Tools. Simple Solutions.
Free online tools to resize photos and signatures for forms, merge and split PDFs, create QR codes and calculate EMI, GST and more.
31 free tools · No sign-up · Works on phone and computer
Tool categories
Image Tools
Resize, compress, crop and convert photos and signatures.
9 tools →
PDF Tools
Merge, split, rotate, reorder and convert PDF files.
7 tools →
QR Tools
Create QR codes for links, WhatsApp, Wi-Fi, contacts and more.
7 tools →
Calculators
EMI, GST, age, percentage, interest, discount and BMI calculators.
8 tools →
Featured tools
Photo ResizerResize a photo to exact pixels and a maximum KB size for online forms. Signature ResizerResize and clean up a scanned signature to the size an application asks for. Image Size CompressorReduce JPG, PNG or WebP file size by quality or to a target KB. PDF MergerCombine several PDF files into one document in the order you choose. Images to PDFCombine JPG and PNG images into a single PDF. URL QR Code GeneratorCreate a QR code that opens a website link. EMI CalculatorMonthly EMI, total interest and repayment schedule for a loan. GST CalculatorAdd or remove GST and split it into CGST/SGST or IGST.
Popular tasks
Everyday jobs people often need help with.
How CentralMirror works
- 1
Choose a tool
Pick a tool from the categories or search for what you need.
- 2
Add your file or details
Drag in a file or type your details. Nothing is uploaded.
- 3
Download the result
Check the preview and final size, then download instantly.
Private by design
Most online tools upload your files to a server. CentralMirror's image, PDF and QR tools do the work inside your browser instead, so ID photos, signatures and documents stay on your device.
Read our privacy policy →No uploads
Images and PDFs are processed on your device.
Fast
No waiting for uploads or downloads to a server.
No sign-up
No account, no email address, no watermark.
Checked results
Final sizes are shown and QR codes are verified.
Recently added
Photo ResizerResize a photo to exact pixels and a maximum KB size for online forms. Signature ResizerResize and clean up a scanned signature to the size an application asks for. Image Dimension ChangerChange image width and height in pixels or by percentage, keeping the format. Image Size CompressorReduce JPG, PNG or WebP file size by quality or to a target KB. Image CropperCrop an image freely or to a fixed shape such as square or passport ratio. JPG to JPEGRename a .jpg file to .jpeg (or back) without changing image quality.
Helpful guides
All guides →How to Resize a Photo to 20 KB for Online Forms
Get a photo under 20 KB at the exact pixel size a form asks for, and avoid the common mistakes that make uploads fail.
How to Resize a Signature for Online Forms
From pen and paper to a clean, correctly sized signature image that upload forms accept.
How to Compress JPG Images Without Losing Visible Quality
Make JPG files several times smaller while keeping them looking the same, and know when to change format instead.
Frequently asked questions
Are CentralMirror tools really free?
Yes. All tools are free to use with no sign-up and no watermarks.
Are my files uploaded to your servers?
No. Image, PDF and QR tools run inside your browser, so your files stay on your device. Each tool page explains exactly how it handles your data.
Do the tools work on mobile phones?
Yes. Every tool is designed for phones as well as computers. Very large files may be slower on older phones because the work happens on your device.
Will a resized photo be accepted by my application form?
The tools give you exact control over pixels and file size and show the final values, but every organisation sets its own rules. Always compare the result with your official instructions before submitting.
Which browsers are supported?
Current versions of Chrome, Edge, Firefox and Safari on Android, iPhone, Windows and Mac.