Practical guides to images, PDFs and developer tasks from OptiPress, the private browser toolbox.https://optipress.inenhttps://optipress.in/blog/75-percent-attendance-how-many-classes-can-i-misshttps://optipress.in/blog/75-percent-attendance-how-many-classes-can-i-missFormulas for how many classes you can skip and still keep 75% attendance, how many you must attend to recover, and how to plan the rest of the term.Thu, 12 Nov 2026 00:00:00 GMTAttendanceStudentshttps://optipress.in/blog/cgpa-to-percentage-official-formulashttps://optipress.in/blog/cgpa-to-percentage-official-formulasThere's no single CGPA-to-percentage formula. See the official one for CBSE, VTU, Anna University, AKTU, JNTU, DU and MAKAUT, with the source for each.Thu, 12 Nov 2026 00:00:00 GMTCGPAStudentshttps://optipress.in/blog/exam-age-limit-as-on-date-explainedhttps://optipress.in/blog/exam-age-limit-as-on-date-explainedHow Indian recruitment notices count age: the cut-off date, what an upper limit of 27 really means, OBC, SC/ST and PwBD relaxation, with 2026 examples.Thu, 12 Nov 2026 00:00:00 GMTExamsStudentshttps://optipress.in/blog/how-to-compress-a-video-to-10mb-or-25mbhttps://optipress.in/blog/how-to-compress-a-video-to-10mb-or-25mbWhy video files are big, how size, bitrate and length are linked, and how to shrink a video to fit an email or form limit right in your browser.Thu, 12 Nov 2026 00:00:00 GMTVideoCompressionhttps://optipress.in/blog/make-a-video-for-instagram-reels-and-youtube-shortshttps://optipress.in/blog/make-a-video-for-instagram-reels-and-youtube-shortsTurn a landscape video into a vertical 9:16 Reel, Short or Status: crop it, trim the best part, and keep the file small, all in your browser.Thu, 12 Nov 2026 00:00:00 GMTReelsVideoSocial Mediahttps://optipress.in/blog/mov-to-mp4-convert-iphone-videoshttps://optipress.in/blog/mov-to-mp4-convert-iphone-videosWhy iPhone videos come as MOV and HEVC, when converting to MP4 is instant and lossless, and how to convert in your browser without uploading.Thu, 12 Nov 2026 00:00:00 GMTVideoiPhoneConversionhttps://optipress.in/blog/best-image-sizes-for-social-media-and-how-to-resizehttps://optipress.in/blog/best-image-sizes-for-social-media-and-how-to-resizeRecommended image sizes for Instagram, LinkedIn, X, Facebook and TikTok, plus how to resize and crop your images to fit each platform.Wed, 18 Feb 2026 00:00:00 GMTImagesSocial MediaResizingMarketinghttps://optipress.in/blog/compress-images-without-losing-qualityhttps://optipress.in/blog/compress-images-without-losing-qualityHow to make image files much smaller while keeping them sharp: lossy vs lossless compression, choosing JPG, PNG or WebP, and good quality settings.Wed, 18 Feb 2026 00:00:00 GMTImagesPerformanceOptimizationWeb Vitalshttps://optipress.in/blog/compress-pdf-files-online-without-losing-qualityhttps://optipress.in/blog/compress-pdf-files-online-without-losing-qualityStep-by-step guide to reducing PDF file size in your browser without exposing private documents.Wed, 18 Feb 2026 00:00:00 GMTPDFCompressionPerformancehttps://optipress.in/blog/convert-pdf-to-editable-word-document-onlinehttps://optipress.in/blog/convert-pdf-to-editable-word-document-onlineSimple workflow for turning PDFs into Word files you can edit, without installing extra software.Wed, 18 Feb 2026 00:00:00 GMTPDFWordConversionhttps://optipress.in/blog/debug-apis-faster-with-online-json-formatterhttps://optipress.in/blog/debug-apis-faster-with-online-json-formatterPretty-print, inspect, and validate JSON responses in your browser to speed up backend and frontend debugging.Wed, 18 Feb 2026 00:00:00 GMTDevelopersJSONAPIshttps://optipress.in/blog/extract-text-from-images-and-pdfs-online-ocrhttps://optipress.in/blog/extract-text-from-images-and-pdfs-online-ocrTurn screenshots, scans, and photos into editable text with a private, browser-based OCR tool.Wed, 18 Feb 2026 00:00:00 GMTOCRImagesProductivityhttps://optipress.in/blog/merge-and-reorder-pdf-pages-onlinehttps://optipress.in/blog/merge-and-reorder-pdf-pages-onlineLearn how to combine PDFs and rearrange pages online without installing desktop software.Wed, 18 Feb 2026 00:00:00 GMTPDFMergeProductivityhttps://optipress.in/blog/password-protect-pdf-online-without-uploadinghttps://optipress.in/blog/password-protect-pdf-online-without-uploadingSecure your PDFs with strong passwords directly in your browser using client-side encryption.Wed, 18 Feb 2026 00:00:00 GMTPDFSecurityEncryptionhttps://optipress.in/blog/png-vs-jpg-which-format-to-usehttps://optipress.in/blog/png-vs-jpg-which-format-to-useLearn when to choose PNG or JPG for UI, photos, screenshots, and product images.Wed, 18 Feb 2026 00:00:00 GMTImagesPNGJPGhttps://optipress.in/blog/why-webp-is-better-for-modern-websiteshttps://optipress.in/blog/why-webp-is-better-for-modern-websitesUnderstand how WebP reduces image size while keeping pages fast and visuals sharp.Wed, 18 Feb 2026 00:00:00 GMTWebPPerformanceFrontend