Image Base64 not working? Check the Data URL prefix first
Distinguish a complete image Data URL from a raw Base64 payload, copy the expected form and check decoding, truncation and privacy before submitting it.
KitNelo Blog
Practical guides
Step-by-step help with office work, creative tasks and digital life. Choose a method, understand its limits and check the result.
Practical guides
PDF compression changes little? Check structure versus scanned images
Understand what PDF structure compression does, compare actual size and page content, and avoid treating object-stream saving as image downsampling or a target-size compressor.
Stitch screenshots into a long PNG without repeated lines
Prepare screenshot order, overlapping text and widths before vertical stitching. Check every seam in the exported PNG and understand local processing, centered images and long-canvas limits.
Export PDF pages as PNG: check count, order and small text
Render every PDF page to PNG and download a ZIP. Verify page-001 filenames, image count, orientation and legibility, with clear limits on rendering scale and searchable text.
White edges after background removal? Check a transparent PNG before delivery
Check a background-removal sample on light, dark and destination backgrounds. Preserve the subject, export a real transparent PNG, and recognize when complex edges need detailed editing.
How to rotate a sideways PDF: check whole-file and mixed page orientations
Save a 90, 180 or 270 degree PDF rotation and inspect the downloaded file. Understand whole-file rotation limits, mixed page directions, and the difference from OCR or print layout.
How to Add Photo Watermarks Without Covering the Subject
Add text or logo watermarks in the browser, then check placement, opacity and readability at the intended display size. Keep originals and inspect batch exports before sharing.
Extract Specific PDF Pages and Check the File Before Sharing
Create a PDF containing selected pages, distinguish file positions from printed page numbers, and check ranges, order, content and filenames. Page extraction does not replace redaction.
Image upload rejected despite a small file? Check pixels and aspect ratio
Separate file size, pixel dimensions and composition. Choose cropping or resizing, check the downloaded output and avoid stretching or a later compression step changing exact dimensions.
Scanned PDF text cannot be copied? Create and check a searchable PDF
Identify image-only scans, create a searchable PDF and TXT with the scan workbench, then check search, copying order and recognition errors without overwriting the original.
How to turn multiple images into one PDF and check page order
Combine JPG, PNG or WebP photos into one PDF using PDF tools. Prepare materials, correct page order and check readability, page dimensions and the final upload size.
How to compress an image to 200 KB without guessing
Reduce a photo to a 200 KB upload limit. Choose JPEG, PNG or WebP, set a size target, control resizing and check the downloaded file for size, dimensions and readable detail.
PNG vs JPG vs WebP: choosing a format for your image
Choose a format for photos, text screenshots and transparent graphics. Compare PNG, JPG and WebP, understand conversion pitfalls and preview the actual exported file.
How to convert HEIC to JPG locally in your browser
Convert phone HEIC/HEIF photos to JPG in KitNelo. Learn how to check a sample, export a batch and handle larger files, metadata changes and unsupported dynamic content.
How to merge multiple PDFs and check the final document
Combine PDFs locally, arrange files and verify the final page order. Learn when to use page editing and what to check for scans, encrypted files and digital signatures.
How to extract text from images with OCR and proofread it
Extract Chinese and English text from screenshots or photos with local batch OCR. Prepare images, export TXT and check common errors, reading order and table limitations.
How to remove EXIF and GPS metadata before sharing photos
Re-encode JPG, PNG and WebP photos locally to remove common metadata. Check the exported file for EXIF and GPS, and review visible clues that metadata cleaning cannot erase.
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